docs: A set of cosmetical changes in documentation

- limit page width to 1100px and adjust frontpage tiles
- make glossary flat structure (remove sub sections)
- add favicon
- disable "View page source" link
- disable Prev,Next buttons
- disable "Built with Sphinx ..." in page footer
- add captions to some pages to shrink names in TOC

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: Ib6844b118c25b4437d7f11014112533fd8d5547b
6 files changed