Binstubs fixes and cleanup

[biow0lf]

This is part of rails 7 changes that are not for rails 7 itself.

1. Remove useless bundler binstubs. Like: bin/byebug, bin/haml, etc. Nobody use them while development or production.
2. Fix ruby version in dokku installation documentation.
3. Regenerate bin/rails and bin/rake via rake rails:update:bin. This is fix production rails console:

/app # rails c
Looks like your app's ./bin/rails is a stub that was generated by Bundler.

In Rails 4, your app's bin/ directory contains executables that are versioned
like any other source code, rather than stubs that are generated on demand.

[biow0lf]

@stevecrozz can you review and merge?

[burnettk]

It's possible someone was depending on the binstubs instead of running bundle exec. that person is not me, and we could always add them back if anyone wants them. approved. :)

[stevecrozz]

I think you're right @biow0lf. I certainly don't use any of those binstubs that were deleted.