- Add link to the new advisory page into the support sidebar.
- Do not include release info in advisory list as it's not that
interesting in this context.
- Try to make it more clear where to report security issues to.
- Include public key directly on web site instead of referring to FTP
site.
- Remove some stale information.
- Misc minor cleanup.
Reviewed by: cperciva, remko, bz (various versions)
