Add form submissions pagination

Added pagy gem to enable pagination and added it's bulma template to the
form submissions page

Gemfile

@@ -30,6 +30,7 @@ gem 'rack-cors'
 gem 'sentry-raven'
 gem 'sequenced'
 gem 'sorcery'
+gem 'pagy', '~> 3.8'
 
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console