Fine tune the a4 settings
Fixes the start page in HTML again.
Switching back from "book" class to "manual" fixes TOC issue

Looks like the sphinx manual class did some extra magic
in order that the bibliography and the index appears
correctly. Page numbering needs to be set manually now
since manual class does not know \*matter commands.
Fix the copyright year.

For the future it might be an idea to generate the last year
dynamically.