[aur-general] packages without category

[Rob Til Freedmen]

There are still >1000 packages without 'Category'
- apparently not a hot topic.

Maybe we add another line to Statistics on the AUR front page just to
let users know of packages not found by the package search function
- unless searched by using 'Category=All', clicked on 'Category' and
reading all entries with 'Category=none' to look for possible search
targets.