docs: Use HTML comments for the kernel-toc SPDX line

This line was initially placed in {# jinja2 comments #}, but that led to an
"invalid token" complaint from spdxcheck.py. Rather than fix the scr

docs: Use HTML comments for the kernel-toc SPDX line

This line was initially placed in {# jinja2 comments #}, but that led to an
"invalid token" complaint from spdxcheck.py. Rather than fix the script
for a usage we'll likely never see anywhere else, just switch to an HTML
comment, which spdxcheck.py thinks is fine.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>

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docs: Add more information to the HTML sidebar

Add a new sidebar template that creates a more RTD-like "fisheye" view of
the current place in the document hierarchy. It is far from ideal, but
some

docs: Add more information to the HTML sidebar

Add a new sidebar template that creates a more RTD-like "fisheye" view of
the current place in the document hierarchy. It is far from ideal, but
some readers may find it better for navigating through the documentation as
a whole.

Add some CSS trickery as well to make the table of contents less intrusive
when viewing the pages on a small screen.

Reviewed-by: Akira Yokosawa <akiyks@gmail.com>
Reviewed-by: David Gow <davidgow@google.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

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