Redesign forms, verify link ownership with rel="me" (#8703)

* Verify link ownership with rel="me"

* Add explanation about verification to UI

* Perform link verifications

* Add click-to-copy widget for verification HTML

* Redesign edit profile page

* Redesign forms

* Improve responsive design of settings pages

* Restore landing page sign-up form

* Fix typo

* Support <link> tags, add spec

* Fix links not being verified on first discovery and passive updates

app/helpers/home_helper.rb

@@ -48,4 +48,12 @@ module HomeHelper
       '1+'
     end
   end
+
+  def custom_field_classes(field)
+    if field.verified?
+      'verified'
+    else
+      'emojify'
+    end
+  end
 end