Proxy server to inject shim (#178)

things to test:

- [x] allow real URL to open in new window
- [x] packaging in electron?
- [ ] does it work on windows?
- [x] make sure it works with older apps
- [x] what about cache / reuse? - maybe use a bigger range of ports??

forge.config.ts

@@ -22,6 +22,9 @@ const ignore = (file: string) => {
   if (file.startsWith("/scaffold")) {
     return false;
   }
+  if (file.startsWith("/worker")) {
+    return false;
+  }
   if (file.startsWith("/node_modules/better-sqlite3")) {
     return false;
   }