Docs, website and publication

[matweldon]

• Write tutorial on training the embedder #12
• Polish up the README #13
• Create a workflow to build the reference docs on PRs into main #14
• Make a video walk-through #15
• Update existing tutorials and their metadata #30
• Add blurb and logos to README #31
• Can we add reference/ qmds to the repo, and build them at PR time? #45
• Final documentation check-through #46