🔨(project) add json, cjs and js extensions to prettier config

Prettier had some missing extensions in the config, this commit
added them, we then prettified the whole project. We
ignore the `cunningham-tokens` files.

apps/demo/.eslintrc.json

@@ -1,9 +1,7 @@
 {
   "root": true,
-  "extends": [
-    "custom"
-  ],
+  "extends": ["custom"],
   "parserOptions": {
     "project": "./tsconfig.eslint.json"
   }
-}
+}