Tidy up some loose ends that no longer work after the apache-1.x server on
hub.freebsd.org and the supporting 15 year old binaries have gone away.

Highlights:

• Sync up the cgi scripts to be closer to the standard page look

and feel and the canonical url locations.

• Adjust the search controls to include the docs.freebsd.org doc set.
• Replace the remaining wais search references.
• Fix up the embedded paths that depended on a symlink and/or nfs jungle

on hub. These aren't present in the jail this now runs in.

• Fix a typo (stray backtick) in one of the header entities.
• Remove the remaining no-longer-functional gnats components - they

ran on hub and no longer exist.

Build tested by: gjb
Brought to you by: lots of coffee, profanity and confusion.