- replace `match` with `get`/`post`/`patch`/`delete`
- format routes.rb
- rename the `show_user_{profile,question,answer}` routes to
`profile`, `question`, `answer` so `url_for` (used by Rails Admin)
works fine for these things
- also add `to_param` to the `User` model so that `url_for(some_user)`
uses the user name