Remove badges and news apps, and reset migrations for banners and links.

Once on this commit, you will have to migrate both the links and banners
apps back down to 0001, using the --fake flag to avoid making actual
database changes, and the --delete-ghost-migrations flag to delete the
leftover migrations that get deleted.

This adjusts deploy.py to run the fake migrations; once this gets merged and pushed to the dev server, I'll merge a commit that removes them. This will let us run the fake migrations once on the servers by pushing this commit, and then pushing the master branch.