createAddMeToYourFriendsButton should become a web component in solid-ui

[timea-solid]

createAddMeToYourFriendsButton is used in profile-pane and imported in social-pane. This is not corect architecturarly.

[SharonStrats]

The PR is in solid-ui, i'm not sure how to link it. it's this one SolidOS/solid-ui#826

[timea-solid]

Also make a PR here to use it than.