Deploy docs to GitHub pages

[Yaytay]

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[Yaytay]

The docs are now in github pages, but without any navigation, so that's a bit useless.
It does, at least, give a location for the latest release 'starter' compose file:
https://yaytay.github.io/query-engine/query-engine-compose.yml

[Yaytay]

https://yaytay.github.io/query-engine/Introduction.html

[Yaytay]

Contents page works, so this works: https://yaytay.github.io/query-engine/
Want to put inter-file navigation.