Update README.md to remove warning about using legacy CSS bundlers

This has been resolved in rails#243, thank you @florian2

Author: salmonsteak1

README.md

@@ -54,8 +54,6 @@ For example, if you're using the Dockerfile generated by Rails with an API-only
 RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
 ```
 
-*Note: Legacy CSS bundlers `sass-rails` and `sassc-rails` may fail to compile some of the CSS vendored into this library from [Bulma](https://github.com/jgthms/bulma), which was created in [Dart SASS](https://sass-lang.com/dart-sass/). You will therefore need to upgrade to `dartsass-rails` or some library that relies on it, like `cssbundling-rails`.*
-
 ### Authentication
 
 Mission Control comes with **HTTP basic authentication enabled and closed** by default. Credentials are stored in [Rails's credentials](https://edgeguides.rubyonrails.org/security.html#custom-credentials) like this: