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/webhooks/index.json.jbuilder

@@ -0,0 +1,5 @@
+json.payload do
+  json.webhooks do
+    json.array! @webhooks, partial: 'webhook', as: :webhook
+  end
+end