wikidata dir added to htdocs

[Daniel Berlin]

I've added a wikidata dir to htdocs that contains all the templates and 
css files for the wiki.

The source code is going to be in a subdir of wwwdocs, so that we can keep 
the templates and css separate from the actual code of the thing.

If you'd rather have the template dirs and code in the same place (IE all 
in wikidata/), i'm happy to do that too.