Make Ember (the framework) Tutorial using embedded StackBlitz SDK

[NullVoxPopuli]

Docs: https://developer.stackblitz.com/platform/api/javascript-sdk
Prereq:

• embroider ships vite support
• I make another subdomain, maybe https://ember.glimdown.com
• Figure out how to load up stackblitz projects based off some starter template + some modifications to allow the tutorial chapters to be hosted within this repo

Nice to have:

• stackblitz provides a way to hide files, or categorize them somehow?
  since frameworks tend to have a lot of boilerplate (at least for mostly empty projects), it would be nice to guide focus to only reveal what files are needed for a given tutorial chapter.