Docs: Restructure in the Platfoms section

- Move platforms' documentaions from /ext/target/ to the /platform folder
- Name arm platforms in TOC explicitly.
- Merge CS-1000 platform README with Openamp doc
- Rebase and include RSS platform

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: If8bc343e92910e2ce94f1fe1d6c8c81802d63165
diff --git a/docs/platform/ext/target/arm/corstone1000/openamp/images/example_psa_call_workflow.png b/docs/platform/arm/corstone1000/openamp/images/example_psa_call_workflow.png
similarity index 100%
rename from docs/platform/ext/target/arm/corstone1000/openamp/images/example_psa_call_workflow.png
rename to docs/platform/arm/corstone1000/openamp/images/example_psa_call_workflow.png
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diff --git a/docs/platform/ext/target/arm/corstone1000/openamp/readme.rst b/docs/platform/arm/corstone1000/openamp/readme.rst
similarity index 100%
rename from docs/platform/ext/target/arm/corstone1000/openamp/readme.rst
rename to docs/platform/arm/corstone1000/openamp/readme.rst
diff --git a/docs/platform/ext/target/arm/corstone1000/readme.rst b/docs/platform/arm/corstone1000/readme.rst
similarity index 97%
rename from docs/platform/ext/target/arm/corstone1000/readme.rst
rename to docs/platform/arm/corstone1000/readme.rst
index 10c9c58..3925455 100644
--- a/docs/platform/ext/target/arm/corstone1000/readme.rst
+++ b/docs/platform/arm/corstone1000/readme.rst
@@ -1,6 +1,6 @@
-##################
-ARM: Corstone-1000
-##################
+#############
+Corstone-1000
+#############
 
 ************
 Introduction
@@ -21,6 +21,12 @@
 The communication between NSPE and SPE is based on PSA IPC protocol running on
 top of FF-A/OpenAMP.
 
+.. toctree::
+    :maxdepth: 1
+    :glob:
+
+    openamp/**
+
 The secure enclave subsystem has ARM's CC-312 (Crypto Cell) hardware to
 accelerate cryptographic operations. Additionaly, platform supports Secure Debug
 using SDC-600 as the communication interface between host debugger and platform
diff --git a/docs/platform/arm/index.rst b/docs/platform/arm/index.rst
new file mode 100755
index 0000000..48a8223
--- /dev/null
+++ b/docs/platform/arm/index.rst
@@ -0,0 +1,18 @@
+#############
+Arm platforms
+#############
+
+.. toctree::
+    :maxdepth: 1
+
+    Corstone-1000 <corstone1000/readme.rst>
+    Corstone-300 FPGA (AN547) <mps3/an547/README.rst>
+    Corstone-300 FPGA and FVP (AN552) <mps3/an552/README.rst>
+    Corstone-310 FVP <mps3/corstone310_fvp/README.rst>
+    Musca-B1 <musca_b1/sse_200/readme.rst>
+    Musca-B1 Secure Enclave <musca_b1/secure_enclave/readme.rst>
+    Runtime Security Subsystem <rss/readme.rst>
+
+--------------
+
+*Copyright (c) 2022, Arm Limited. All rights reserved.*
diff --git a/docs/platform/ext/target/arm/mps3/an547/README.rst b/docs/platform/arm/mps3/an547/README.rst
similarity index 98%
rename from docs/platform/ext/target/arm/mps3/an547/README.rst
rename to docs/platform/arm/mps3/an547/README.rst
index 7506703..c2e7667 100644
--- a/docs/platform/ext/target/arm/mps3/an547/README.rst
+++ b/docs/platform/arm/mps3/an547/README.rst
@@ -20,7 +20,7 @@
    They can also be run on the Corstone-300 Ethos-U55 Ecosystem FVP
    (FVP_SSE300_MPS3) up until version 11.15. From version 11.16, the FVP
    is aligned with the AN552 FPGA platform. For build information check
-   :doc:`AN552 platform </platform/ext/target/arm/mps3/an552/README>`.
+   :doc:`AN552 platform </platform/arm/mps3/an552/README>`.
 
 To run the example code on Corstone SSE-300 with Ethos-U55 Example Subsystem for MPS3 (AN547)
 ---------------------------------------------------------------------------------------------
diff --git a/docs/platform/ext/target/arm/mps3/an552/README.rst b/docs/platform/arm/mps3/an552/README.rst
similarity index 100%
rename from docs/platform/ext/target/arm/mps3/an552/README.rst
rename to docs/platform/arm/mps3/an552/README.rst
diff --git a/docs/platform/ext/target/arm/mps3/corstone310_fvp/README.rst b/docs/platform/arm/mps3/corstone310_fvp/README.rst
similarity index 100%
rename from docs/platform/ext/target/arm/mps3/corstone310_fvp/README.rst
rename to docs/platform/arm/mps3/corstone310_fvp/README.rst
diff --git a/docs/platform/ext/target/arm/musca_b1/secure_enclave/readme.rst b/docs/platform/arm/musca_b1/secure_enclave/readme.rst
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rename from docs/platform/ext/target/arm/musca_b1/secure_enclave/readme.rst
rename to docs/platform/arm/musca_b1/secure_enclave/readme.rst
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rename from docs/platform/ext/target/arm/musca_b1/sse_200/readme.rst
rename to docs/platform/arm/musca_b1/sse_200/readme.rst
diff --git a/docs/platform/ext/target/arm/rss/readme.rst b/docs/platform/arm/rss/readme.rst
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rename from docs/platform/ext/target/arm/rss/readme.rst
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diff --git a/docs/platform/ext/target/cypress/psoc64/security/keys/readme.rst b/docs/platform/cypress/psoc64/security/keys/readme.rst
similarity index 100%
rename from docs/platform/ext/target/cypress/psoc64/security/keys/readme.rst
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diff --git a/docs/platform/ext/target/arm/corstone1000/index.rst b/docs/platform/ext/target/arm/corstone1000/index.rst
deleted file mode 100755
index 9e3136b..0000000
--- a/docs/platform/ext/target/arm/corstone1000/index.rst
+++ /dev/null
@@ -1,13 +0,0 @@
-Arm Corstone-1000
-=================
-
-.. toctree::
-    :maxdepth: 1
-    :glob:
-
-    readme.rst
-    openamp/**
-
---------------
-
-*Copyright (c) 2022, Arm Limited. All rights reserved.*
diff --git a/docs/platform/ext/target/arm/index.rst b/docs/platform/ext/target/arm/index.rst
deleted file mode 100755
index 866d6df..0000000
--- a/docs/platform/ext/target/arm/index.rst
+++ /dev/null
@@ -1,15 +0,0 @@
-Arm platforms
-=============
-
-.. toctree::
-    :maxdepth: 1
-    :glob:
-
-    corstone1000/index
-    mps3/**
-    musca_b1/**
-    rss/**
-
---------------
-
-*Copyright (c) 2022, Arm Limited. All rights reserved.*
diff --git a/docs/platform/ext/index.rst b/docs/platform/index.rst
similarity index 68%
rename from docs/platform/ext/index.rst
rename to docs/platform/index.rst
index da883ef..4c53ebb 100644
--- a/docs/platform/ext/index.rst
+++ b/docs/platform/index.rst
@@ -1,54 +1,54 @@
+##############
 TF-M Platforms
-==============
+##############
 
 .. toctree::
     :maxdepth: 2
     :caption: arm
-    :glob:
 
-    target/arm/index
+    arm/index
 
 .. toctree::
     :maxdepth: 1
     :caption: NXP
     :glob:
 
-    target/nxp/**
+    nxp/**
 
 .. toctree::
     :maxdepth: 1
     :caption: Cypress
     :glob:
 
-    target/cypress/psoc64/index
+    cypress/psoc64/index
 
 .. toctree::
     :maxdepth: 2
     :caption: STM
     :glob:
 
-    target/stm/index
+    stm/index
 
 .. toctree::
-    :maxdepth: 2
+    :maxdepth: 1
     :caption: Nordic
     :glob:
 
-    target/nordic_nrf/**
+    nordic_nrf/**
 
 .. toctree::
-    :maxdepth: 2
+    :maxdepth: 1
     :caption: Laird Connectivity
     :glob:
 
-    target/lairdconnectivity/**
+    lairdconnectivity/**
 
 .. toctree::
     :maxdepth: 1
     :caption: Nuvoton
     :glob:
 
-    target/nuvoton/**
+    nuvoton/**
 
 --------------
 
diff --git a/docs/platform/ext/target/lairdconnectivity/bl5340_dvk_cpuapp/README.rst b/docs/platform/lairdconnectivity/bl5340_dvk_cpuapp/README.rst
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rename from docs/platform/ext/target/lairdconnectivity/bl5340_dvk_cpuapp/README.rst
rename to docs/platform/lairdconnectivity/bl5340_dvk_cpuapp/README.rst
diff --git a/docs/platform/ext/target/nordic_nrf/nrf5340dk_nrf5340_cpuapp/README.rst b/docs/platform/nordic_nrf/nrf5340dk_nrf5340_cpuapp/README.rst
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rename from docs/platform/ext/target/nordic_nrf/nrf5340dk_nrf5340_cpuapp/README.rst
rename to docs/platform/nordic_nrf/nrf5340dk_nrf5340_cpuapp/README.rst
diff --git a/docs/platform/ext/target/nordic_nrf/nrf9160dk_nrf9160/README.rst b/docs/platform/nordic_nrf/nrf9160dk_nrf9160/README.rst
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rename from docs/platform/ext/target/nordic_nrf/nrf9160dk_nrf9160/README.rst
rename to docs/platform/nordic_nrf/nrf9160dk_nrf9160/README.rst
diff --git a/docs/platform/ext/target/nuvoton/m2351/README.rst b/docs/platform/nuvoton/m2351/README.rst
similarity index 100%
rename from docs/platform/ext/target/nuvoton/m2351/README.rst
rename to docs/platform/nuvoton/m2351/README.rst
diff --git a/docs/platform/ext/target/nuvoton/m2354/README.rst b/docs/platform/nuvoton/m2354/README.rst
similarity index 100%
rename from docs/platform/ext/target/nuvoton/m2354/README.rst
rename to docs/platform/nuvoton/m2354/README.rst
diff --git a/docs/platform/ext/target/nxp/lpcxpresso55s69/README.rst b/docs/platform/nxp/lpcxpresso55s69/README.rst
similarity index 100%
rename from docs/platform/ext/target/nxp/lpcxpresso55s69/README.rst
rename to docs/platform/nxp/lpcxpresso55s69/README.rst
diff --git a/docs/platform/ext/platform_introduction.rst b/docs/platform/platform_introduction.rst
similarity index 95%
rename from docs/platform/ext/platform_introduction.rst
rename to docs/platform/platform_introduction.rst
index b6fecda..1e215e9 100644
--- a/docs/platform/ext/platform_introduction.rst
+++ b/docs/platform/platform_introduction.rst
@@ -60,11 +60,11 @@
 
     - Secure Enclave system:
 
-        - :doc:`Musca-B1 Secure Enclave. </platform/ext/target/arm/musca_b1/secure_enclave/readme>`
+        - :doc:`Musca-B1 Secure Enclave. </platform/arm/musca_b1/secure_enclave/readme>`
 
     - Runtime Security Subsystem (RSS):
 
-        - :doc:`RSS. </platform/ext/target/arm/rss/readme>`
+        - :doc:`RSS. </platform/arm/rss/readme>`
 
 The document :doc:`Platform Deprecation and Removal </integration_guide/platform/platform_deprecation>`
 lists the deprecated platforms, removed from the upstream.
diff --git a/docs/platform/ext/target/stm/b_u585i_iot02a/readme.rst b/docs/platform/stm/b_u585i_iot02a/readme.rst
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rename from docs/platform/ext/target/stm/b_u585i_iot02a/readme.rst
rename to docs/platform/stm/b_u585i_iot02a/readme.rst
diff --git a/docs/platform/ext/target/stm/common/stm32l5xx/readme.rst b/docs/platform/stm/common/stm32l5xx/readme.rst
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rename from docs/platform/ext/target/stm/common/stm32l5xx/readme.rst
rename to docs/platform/stm/common/stm32l5xx/readme.rst
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