As we're adding some actions to the starter, it doesn't make sense to keep them in the cloned projects with `create-medusa-app`. This PR removes the `.github` directory from the project after cloning it
- Remove `v2` option and install V2 starter branch by default.
- Use new `exec` command to seed data
- Install v2 branch of next.js starter if the option is provided.
- Change the opened browser to `localhost:9000/app`.
- Added a bunch of todos for onboarding flows once we have that
