Unify bin/dev script with other js/css installers

[marcoroth]

In a similar manner to rails/dartsass-rails#35.

This Pull Request streamlines the content of the bin/dev script across rails/tailwindcss-rails, rails/dartsass-rails, rails/jsbundling-rails and rails/cssbundling-rails so you don't run into conflicts when running multiple installers:

❯ rails tailwindcss:install
Add Tailwindcss include tags and container element in application layout
    insert  app/views/layouts/application.html.erb

Build into app/assets/builds
    exist  app/assets/builds
    identical  app/assets/builds/.keep
    append  Procfile.dev

Add bin/dev to start foreman
    conflict  bin/dev

Overwrite /Users/marcoroth/Development/project/bin/dev? (enter "h" for help) [Ynaqdhm]

This PR applies the changes from rails/cssbundling-rails#93 and rails/cssbundling-rails#98

[flavorjones]

This seems reasonable to me. I've pinged @rafaelfranca to make sure these PRs (this and the dartsass-rails PR) are merged or changed together.

[flavorjones]

I'll cut a release tomorrow with this change.

[flavorjones]

Release v2.0.19 / 2022-11-08 · rails/tailwindcss-rails

[marcoroth]

Thank you @flavorjones!