Feature: Introduce Super Admins (#705)

* Feature: Introduce Super Admins

- added new devise model for super user
- added administrate gem
- sample dashboards for users and accounts

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

spec/factories/super_admins.rb

@@ -0,0 +1,6 @@
+FactoryBot.define do
+  factory :super_admin do
+    email { "admin@#{SecureRandom.uuid}.com" }
+    password { 'password' }
+  end
+end