Migrate to pnpm because npm-with-workspaces really barfs with multiplatform (dev on apple silicon, CI on linux x86_64)

Author: nedtwigg

browser-extension/package.json

@@ -4,7 +4,7 @@
     "@wxt-dev/webextension-polyfill": "^1.0.0",
     "highlight.js": "^11.11.1",
     "markdown-actions": "^1.1.2",
-    "overtype": "file:../packages/overtype",
+    "overtype": "workspace:*",
     "webextension-polyfill": "^0.12.0"
   },
   "description": "Syntax highlighting and autosave for comments on GitHub (and other other markdown-friendly websites).",