This milestone seeks to the currently signed in user's coaching session page data to be changed and updated on the backend.

This should be implemented as a "live update" style on the frontend.

Definition of done:

1. Coaching note data can be changed and updated
2. Overarching goal data can be changed and updated
3. Agreements data can be changed and updated
4. Actions data can be changed and updated
5. Coach's note data can be changed and updated