Merge branch 'html' into docs-mw

The current sidebar in the HTML version of the documentation does not
display the section titles because the toctree directives in the
top-level index.rst document do not contain ":caption:" properties.
Replacing the current section titles by ":caption:" properties would not
allow having text between those and the table of contents.

To workaround this issue, add the ":caption:" properties in the toctree
calls which makes them show up in the sidebar, but hide them from the
index page with a custom CSS addition.

Additionally, make the section titles in the sidebar bold to make them
stand-out.

This makes the overall structure of the documentation clearer from the
sidebar directly.

PS: This is how I've implemented this in the Yocto Project
documentation[1] where I faced the same issue. See also the index.rst
file[2] (which was by the way inspired by the kernel's own index.rst)
and CSS addition[3].

[1]: https://docs.yoctoproject.org/dev/
[2]: https://git.yoctoproject.org/yocto-docs/tree/documentation/index.rst
[3]: https://git.yoctoproject.org/yocto-docs/tree/documentation/sphinx-static/theme_overrides.css#n106

[jc: I tweaked the CSS slightly, any problems there are my fault]

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