The main motive of this commit is to make the offline copy of the HTML doc as
pretty as the online (ffmpeg.org) one. This also introduced new styles for
<h2> to <h4>.
Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

The W3C validator complains about these.
Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>

The recent texi2html exports the title as 'fulltitle_no_texi'.

The attribute container of the top-level div is changed from "class" to
"id" to match the website CSS.

Improve consistency between website docs and local documentation style.

Signed-off-by: Mans Rullgard <mans@mansr.com>

It adds the following header to the HTML files:
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
which helps some browsers to display correctly the few non-ASCII
characters in the doc.

Add "note" or "important" class to the generated div.

The navigation header for the web pages lives in a different repository.
Read it during documentation regeneration to use the same navigation bar
on all pages.

Single-quoted strings are printed verbatim in perl.

make it use the website css and start structuring it so it is consistent

The generated HTML files are similar to the ones generated with
texi2html 1.56k used on the website.

Tested with texi2html 1.78 and 5.0. 1.78 is the minimal recommended
version.

The removed @sp from the titlepage section were ignored until
texi2html 5.0. If not removed the pages generated by 5.0 will have ugly
empty space around the title.
(cherry picked from commit a8f0814a)

The generated HTML files are similar to the ones generated with
texi2html 1.56k used on the website.

Tested with texi2html 1.78 and 5.0. 1.78 is the minimal recommended
version.

The removed @sp from the titlepage section were ignored until
texi2html 5.0. If not removed the pages generated by 5.0 will have ugly
empty space around the title.