Support Rails 8.0

[schmijos]

I just tried to use Hotsheet with Rails 8. The gem expects the Sprockets manifest. Is Sprockets a hard requirement to this gem?

/Users/josua/.asdf/installs/ruby/3.3.5/lib/ruby/gems/3.3.0/gems/sprockets-rails-3.5.2/lib/sprockets/railtie.rb:106:in `block in <class:Railtie>': Expected to find a manifest file in `app/assets/config/manifest.js` (Sprockets::Railtie::ManifestNeededError)
But did not, please create this file and use it to link any assets that need
to be rendered by your app:

Example:
  //= link_tree ../images
  //= link_directory ../javascripts .js
  //= link_directory ../stylesheets .css
and restart your server