Make the playground run in other pages, and start of a workbench page

Author: orta

.prettierrc

@@ -1,5 +1,6 @@
 {
   "semi": false,
   "singleQuote": false,
-  "printWidth": 120
+  "printWidth": 120,
+  "arrowParens": "avoid"
 }

package.json

@@ -36,12 +36,6 @@
     "clean": "yarn workspace typescriptlang-org gatsby clean",
     "test": "CI=true yarn workspaces run test"
   },
-  "prettier": {
-    "printWidth": 120,
-    "semi": false,
-    "singleQuote": true,
-    "trailingComma": "es5"
-  },
   "dependencies": {
     "serve-handler": "^6.1.2"
   },

packages/playground-examples/.prettierrc

@@ -4,5 +4,6 @@
   "singleQuote": false,
   "tabWidth": 2,
   "printWidth": 120,
-  "trailingComma": "es5"
+  "trailingComma": "es5",
+  "arrowParens": "avoid"
 }