Update Rails Sample App with the latest one

[tnir]

https://github.com/gitpod-io/rails_sample_app is now based on 4th edition of some book, which is extremely stale.

Replace it with https://github.com/mhartl/sample_app_6th_ed

[tnir]

@svenefftinge @akosyakov What do you think while I prepared gitpod-io/rails_sample_app#3 gitpod-io/rails_sample_app#4?

[ghuntley]

gitpod-io/rails_sample_app is now based on 4th edition of some book, which is extremely stale.

Thanks for bringing this to our attention.

Replace it with mhartl/sample_app_6th_ed

I agree. See https://github.com/gitpod-io/example-ruby-on-rails

[tnir]

Thanks @ghuntley. With this, I hope we work on gitpod-io/workspace-images#407 😀

[tnir]

@ghuntley Sorry, what is left to do?