Update intro videos for getting started and debugging

[auchenberg]

This item covers the updates for our intro videos https://code.visualstudio.com/docs/getstarted/introvideos

Videos to include on page:

• Getting started with VS Code, https://youtu.be/Sdg0ef2PpBw
• Debugging - https://www.youtube.com/watch?v=2oFKNL7vYV8