WBCAMS-14 link to Career Trek site on associated right-side video

[rjkuyvenhoven]

To validate post update: http://workbc.docker.localhost:8000/admin/reports/career-trek-validation

[infojunkie]

Thanks, working well for me. Some comments:

• I added a default value for the CT base URL on local
• We need to wait for the CAREERTREK_URL variable to be added on DEV to merge
• There is an updated CT dataset dropping soon which will contain the "official" URL for each episode - we'll update the migration here to use that instead