Decide support model for tutorials

[JoshOrndorff]

This repo contains working code for a bitcoin-like node built on Substrate. It also contains materials related to a workshop and video tutorial. It is ideal to keep the code up to date with recent versions of Substrate. However, the video tutorials reference a specific commit in the past. A final complication is that the UTXO videos refer to a branch, not a commit or a tag, as their starting point, so pushing additional commits to that branch will be confusing for video watchers.

This issue is to decide how to maintain the code and also the workshop including starter code, non-repo assets like videos, etc. Some options:

• One repo for the updated code, another for the workshop code
• Switch to using folders for starting points rather than separate branches, they are both updated together.