Wire up core Rails JS

[dcollie2]

Summary

We used CDNs directly in our layout so we could get up and running quickly with a decent design theme. We need to get our core Rails JS in place by configuring and loading application.js.

Why

Because we are not loading application.js, we do not have the wiring in place for Hotwired and we do not have the option of adding our CDN links to importmaps.

Criteria for completion

• Application.js is properly loaded in all layouts
• The CDN assets we are using for our themes load properly via importmaps
• CDN assets are no longer directly called in the layouts
• Stimulus controllers load properly (even though we are not yet using them)
• We have removed bootstrap from application.js since we're getting it via theme CDN