The Search funtion on both manuals, the frozen 2.0.0 and the alpha editable, appears to be broken.
 
You get:  Fatal error: Class 'SphinxSearch' not found in /var/www/manual.audacityteam.org/htdocs/includes/search/SearchEngine.php on line 439
IMHO this is a P1 - but I have no idea how to fix it ...
 
Peter.
 
Peter Sampson
Tel: +44 (0)1625 524 780
Mob: +44 (0)7732 278 299