* Docs: post process output to fix paths so that many mdbooks can be served from sub-directories
* Prevent theme from being modified
* Upload docs to Vercel
* Post process docs
* Process local links
* Docs: only process `index.html` files from the root,
All other files have the correct relative paths to serve assets properly and link to files relatively.
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Co-authored-by: Mark Sinclair <mmsinclair@users.noreply.github.com>