Remove use of RJS

RJS while useful can lead to security issues if implemented incorrectly
and can become brittle and add unnecessary complexity to a simple
problem. I'd like to address the problem at hand (making the application
feel more reactive) at more of an application level using something like
Turbolinks or PJAX. For now though I think having these actions as full
page reloads is fine and removes a bit of complexity and risk.
Don't store location and authenticate for update

store_location_then_authenticate_user! is more useful for follow and
unfollow actions. We'll want to handle authentication/authorization for
the update action a bit differently once oc-id is in place. Also remove
the flash message from the update action as it doesn't add a ton of value.