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This PR adds the ruby-lsp-rails gem in development.
It injects a Rack app into development on /ruby_lsp_rails/ so that the ruby-lsp can show attributes and types in your editor, should be useful for helping anyone new to the codebase get to grips with all the things that exist.
I've also updated the Gemfile to read the ruby version from .ruby-version, which reduces some duplication and makes it a little easier to upgrade the version in future.