While this is clearly aimed at personal use, I wonder if it could be extended to serve as a lab notebook for a small research group.

Storing time-stamped, signed Markdown notes with version control and with some hierarchy (daily notes, brainstorm ideas, versioned lab protocols etc.) would be great.

Right now I use on site GitLab & private GitHub repo, but for the not computer savvy users this seems to be too much. Ability to add images to documents using menus/mouse is crucial.