Remove dartsass-rails requirement from alchemy_cms.rb

[sascha-karnatz]

What is this pull request for?

dartsass-rails is not a requirement in the gemspec and is not necessary for the application, that is using alchemy_cms. Dartsass is necessary for the dummy app and because it is in the Gemfile it will be automatically required by Bundler.

Checklist

• [x] I have followed Pull Request guidelines
• [x] I have added a detailed description into each commit message
• [ ] I have added tests to cover this change

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.96%. Comparing base (4774203) to head (dc2a3d7).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2941 +/- ## ========================================== - Coverage 95.96% 95.96% -0.01% ========================================== Files 232 232 Lines 6272 6271 -1 ========================================== - Hits 6019 6018 -1 Misses 253 253 ```

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