Restyling user profile page

[dtonon]

This proposal aims to restyle the user profile page with the goal to make the npub and the follow/message CTAs more prominent. The NIP-05 visualization follow the rules defined in #384. Following and followers are integrated in the horizontal menu, and should be listed on the same view, avoiding opening a different interface (the bottom-up sheet).

For followed profiles, the "Following" button is hidden and the "Unfollow" action is present just in the top-right menu, because it is a low frequency action.