Give your README some love. It's the first thing someone sees when they open your app. It doesn't need anything fancy, but at least give some basic setup instructions to get the app up and running (ruby version, bundling, rails server, how to run specs, etc). Basically just answer the questions that are in there as boilerplate. There may be developers that aren't familiar with rails reviewing your app and they'll appreciate it.
- Remove anything you don't need
- turbolinks
- jbuilder
- sdoc