Adds a tutorial project under nx-dev
The tutorials are run in browser and can be accessed here:
[/tutorials](https://nx-dev-git-nx-dev-tutorialkit-nrwl.vercel.app/tutorials)
The tutorials include:
- TypeScript Packages
- React Monorepo
- Angular Monorepo
In the future, we will link directly from the sidebar to the in-browser
tutorials.
