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

---------

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

packages/eslint-plugin-twenty/package.json

@@ -0,0 +1,8 @@
+{
+    "name": "eslint-plugin-twenty",
+    "version": "0.0.1",
+    "main": "index.js",
+    "dependencies": {
+        "postcss": "^8.4.24"
+    }
+}