Add better error page for profile page

[RafaelCenzano]

Currently it just has the text "Profile not found", we should have a better error page that provides a button to return back or something

At a minimum the page should look better then just p tags. We can have text saying there was a mistake. One page for not found, like profile or user not found, and then a general error page where we say try to refresh or contact the developers.