Remove chrome-extension-hello-world workspace

Its usefulness has expired now that we have the `leetcode-zen-mode` extension as an example.

Author: miorel

package.json

@@ -6,7 +6,6 @@
   },
   "workspaces": [
     "workspaces/adventure-pack",
-    "workspaces/chrome-extension-hello-world",
     "workspaces/download-leetcode-submissions",
     "workspaces/eslint-config",
     "workspaces/fetch-leetcode-problem-list",