Remove closed, private and fishbowl wikis

Update the list of wikis to exclude wikis on the closed, private and
fishbowl lists. Also provide a script that can be used to recreate the
list periodically. It should really only need to be updated once per
Wikimania cycle.

Bug: 58226
Change-Id: I07310bd2162c5ec8bc33c64ef9d62bf07903f1a3