This PR has changes that integrate wagtail built-in api endpoints so we can retrieve content used in program letters from mit-open.
How can this be tested?
Checkout this branch.
If you dont already have some mock data, create a ProgramPage via /cms - make sure it is not sitting in the 'root' (should be a child of the "Micromasters Home" page. Fill out the required fields in addition to the fields starting with "programletter*"
What are the relevant tickets?
Closes #3711
Description (What does it do?)
This PR has changes that integrate wagtail built-in api endpoints so we can retrieve content used in program letters from mit-open.
How can this be tested?