:tv: Adds missing youtube_urls

[jefftriplett]

This PR is part of #272 and it add videos for these talks:

• [x] https://2023.djangocon.us/talks/what-django-deployment-is-really-about/
• [x] https://2023.djangocon.us/talks/django-migrations-friend-or-foe-optimize-your-django-migrations-for-faster-testing/

[jefftriplett]

We can post-merge address this. I'm curious if these videos will show up once this is merged.

[jefftriplett]

✅ confirmed that these show up now.