Fix COUCHDB-1863 add 'Documentation' section/toplink to www.coucdhb.org page

- The mailing lists no longer have a toplink
- The mailing lists are now broken in two sections:
    - user-oriented (announce, user)
    - developer-oriented (the rest)
- New "book" icon for documentation comes from Font-Awesome
- Staged version at http://hiperactivo.com/~kandinski/couchdb.org/