Remove turbo links stuff

We don’t utilize nor interact with turbolinks at all, so remove its
attributes from the stylesheet and javascript elements in the layout
file.
Remove ActiveRecord configuration from dummy Rails app config

We explicitly do not use ActiveRecord in our dummy app, so remove some
configuration from our dev and production environment configuration.
Remove route examples

From the config/routes.rb file.
Add index route to dummy app

We will use the dummy app for integration testing. Adding an index
route lets us actually run the app for debugging purposes.
Add javascript files to the dummy app

These will be used during integration testing. We will test the
processing of these files.
Add route for the javascript assets to the dummy app

The ‘assets’ route grabs our test javascript files and renders them as
a JSON response. That way, we can use a Rails controller test as an
integration test, and test against the processed assets.
Add baseline integration test

Currently, there is no asset processing taking place, so we just test
the javascript test files as-is.
Merge branch 'setup-integration-testing'