Add protocol handler. Handle follow intents (#4511)

* Add protocol handler. Handle follow intents

* Add share intent

* Improve code in intents controller

* Adjust share form CSS

app/serializers/initial_state_serializer.rb

@@ -34,6 +34,8 @@ class InitialStateSerializer < ActiveModel::Serializer
       store[:default_sensitive] = object.current_account.user.setting_default_sensitive
     end
 
+    store[:text] = object.text if object.text
+
     store
   end