Unify search by tag with the search results.

https://github.com/madewithbytes/us_ignite/issues/185

This narrows the search to only selected items of the
same category, but using the same mechanics as the
regular search.
Unify event list search results.

https://github.com/madewithbytes/us_ignite/issues/185
Unify hub list search results.
Unify organization list search results.
Unify resource list search results.