Chore: Scope URLs with account_id (#601)

* Chore: Enable Users to create multiple accounts

Addresses: #402
- migrations to split roles and other attributes from users table
- make changes in code to accommodate this change

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

app/views/api/v1/accounts/callbacks/facebook_pages.json.jbuilder

@@ -0,0 +1,4 @@
+json.data do
+  json.page_details @page_details
+  json.user_access_token @user_access_token
+end