Add dev scripts to package.json in Tutor supported MFEs

[brian-smith-tcril]

MFE development outside of docker with Tutor is possible (and documented as of openedx/frontend-app-learning#1472).

We should update all Tutor supported MFEs so npm run dev works for local development with Tutor!

Tasks

Beta Give feedback

1. Authn
2. Authoring docs: update the README with an easy way to run the MFE with Tutor (on your host) frontend-app-authoring#1364
3. Discussions
4. Account
5. Communications
6. Gradebook
7. Learner Dashboard chore: add dev script to package.json frontend-app-learner-dashboard#530
8. Learning Update README to explain how to run this using Tutor frontend-app-learning#1472
9. ORA Grading
10. Profile