Package & publish todo example to package registry for testing

[Yukaii]

• Build the existing package with form (Or just use local packages for testing)
• Use libnpmpublish to write a sample script that uploads to github registry (Or upload it manually)

[Yukaii]

Modify raycast build output's package.json with:

- "name": "todo-list",
+ "name": "@BlastLauncher/todo-list",
+ "repository": "https://github.com/BlastLauncher/extensions-registry.git",

With new npmrc config:

@BlastLauncher:registry=https://npm.pkg.github.com
//npm.pkg.github.com/:_authToken=xxxxxxx

[Yukaii]

And the package is now available at https://github.com/BlastLauncher/extensions-registry/pkgs/npm/todo-list

I'll stop here and start working on extension marketplace.

[Yukaii]

To publish package changes from mirror of raycast/extensions repo:

1. For new extensions, just run publish
2. For updated extension, fetch latest version and bump minor version and publish it
3. If package name has changed, remove the old version and publish the new one.