Add a custom rule to prevent colors from being hardcoded outside of theme (#288)

* Add a custom rule to prevent colors from being hardcoded in ESLint

* Refactor colors

* Create packages folder and fix colors

* Remove external dependency for css alphabetical order linting

* Fix install with yarn

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Co-authored-by: Charles Bochet <charles@twenty.com>

.devcontainer/devcontainer.json

@@ -6,5 +6,5 @@
 	  "ghcr.io/devcontainers-contrib/features/jshint:2": {}
 	},
 	"forwardPorts": [3000, 3001, 5432],
-	 "postCreateCommand": "cd front && npm install && cd ../server && npm install"
+	 "postCreateCommand": "cd front && yarn && cd ../server && yarn"
   }