If a user clicks their username and they do not have a user page they should either see our special:userprofile page or a CTA that asks if they want to create one.
There also needs to be a link to contribs and user talk page somewhere on the mobile site.
**Final mocks**
{M126}
**HTML prototype for styles and assets **
http://nirzar.github.io/prototypes/mobile-web/userpages/index.html
Acceptance criteria:
[x] Content should be served via User namespace
[x] Content below header should come from the user's user page.
[] Visiting Special:UserProfile in beta should redirect you to the user page.
[] Clicking talk button in user page should open the JavaScript talk dialog to be consistent with main page
[] ~~Remove browser tests for user profiles~~[A]
[A] should be done when pushing to stable - added to T120685