the rationale is to simplify the README file to the bare
minimum. security researchers will be able to find the contact
information if they look minimally and people installing the software
will find a link where relevant (in binary releases only, since all
the others have other trust paths)
also: remove mailing list and irc channel address from development docs,
it is enough to have this information on the main page and on the support page.
README.rst (shown on github and also at the start of the html docs) shall
be like an elevator speech - convince readers in a very short time.
this is most important, everything else can come after we got the reader's interest.
include README into docs to avoid duplication.
also include CHANGES into docs.
add developer docs, move examples from tox.ini there
add separate support docs
remove glossary, most of what was there can be understood by an admin from context
move attic and compatibility note to the end
