Issue: Special:Search

A search function was requested by a number of users in this thread: https://www.vaultwiki.org/showthread.php?t=1490

The logic is that many wiki users will not consider typing a title in the URL, so a page with a search box would be helpful.

While vBulletin search can find articles, it also finds normal threads by default. If we are going to use vBulletin's search function, we need to limit it to searching articles. Also, if an exact title match is found, we should redirect to that article.

The hardest part will be coming up with a design for the main search page.