[Design] Created important button
[Design] Stretched the body to the bottom of the window
[Design] Forms
[Design] Re-introduced register link in menu
[User] Added account removal
[User] Removed pre-registration offer when user is logged in
[User] Removed registration confirmation
[Design] Incremented fields margin

In order to display native form validation error messages correctly.
[Design] Added form errors style
[Design] Added flash style

Also fixed tests bu changing /profile to /account in registration
feature
Merge branch 'feature/design' into develop