Integrate FreeCodeCamp API's in place of the Mock API endpoints

[utsab]

We have two main mock API endpoints:

1. The dashboard gets its data from the /getProfileData endpoint.
2. The join page fetches the student uuid from the /getStudentProfile endpoint

[utsab]

For now (5/11/22), we'll keep using the mock endpoint for 1) while we continue iterating on the front-end. Eventually, the classroom app will get integrated directly into FreeCodeCamp, which will allow the classroom app to talk to the API endpoints more easily. The classroom app will still be able to be deployed independently, but there will be additional authorization steps required in this case for the classroom app to talk to the FreeCodeCamp API.