Purge a lot of really old and obsolete documents, and merge some together
where possible. Lots of efnet docs and the old ircd-ratbox manpage (lol)
was purged.
Reorganise everything nice and neatly as possible. Things describing
features can be found in features/, and some more technical documents
were moved to techinical/.
Old credits file was consolidated into credits-past.txt, and a reference
was added to it in the credits.
- Mention 005 (isupport) token with possibility of different mode letter.
- Explicitly clarify that /accept can be used while -g, and setting -g
does not clear the accept list.
- Mention that some users may be able to bypass +g.
- Mention that /accept may allow more than just going through +g.
- Update to 716/717/718 numerics instead of notices.
- Clarify that the one-minute period applies to messages from all users,
not just one user.
- Add a numerics section with more exact syntax.