Create instructional video for Learn about source code management

We need a video covering the basics of git for #1593 (closed). Once the video is completed, please upload the video to the Onboarding Folder' in Google drive. If you recorded the video using Zoom, please upload the video+audio version of it so it contains everything.

If your video needs editing, please ping myself (@jcolyer) in this issue and I would be more than willing to do this for you!

The video should cover the following:

Checklist:

• Create a branch on a project
• Create a Merge Request on a project
• Lock a file on a project
• Create a discussion on your Merge Request

Documentation:

• Merge Requests
• Create a branch
• File locking
• Discussions

Videos:

• GitLab Flow
  • Covers merge requests and branches
• Need a how-to video instead of a demo
• Need a video for file locking
• How to use Merge Request Commit Discussions