Remove color module

[sandbergja]

It is deprecated, and we don't use it.

Deprecation notice

• [ ] Turn off the module in the UI locally
• [ ] Delete the code for this module from the repo
• [ ] Test locally to make sure the site is still working as expected
• [ ] In staging: turn off the module in the UI (or perhaps the YAML configuration files can do this work for us?)
• [ ] Deploy your branch to staging
• [ ] In prod: turn off the module in the UI
• [ ] Deploy your branch to staging

[kevinreiss]

uninstalled through the admin UI in production.