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I would also look at https://www.mkdocs.org for organising documentation esp if you are used to 'readthedocs' manuals.
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I ended up using Trilium Notes and am quite happy with it: https://github.com/zadam/trilium Needs a little time to get used to it, but has some nice features like built in backups (saved my ass one time big), sync to other instances (running two dockers, one Main, one sync/Backup, additionally after Messing Up - my own fault )