Add outlet to questions search bar.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Refactor filtering of questions.

- It is now possible filter questions by their tags.
- It is also possible to search the title and body of a tag, although
this implementation currently deals with the entire data set and would
thus not be usable when the entire data model is hooked up. We currently
only deal with five semi-static rows.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>