Integrate user attachments

[robvanoostenrijk]

Moved user attachment image uploads into source tree

[Luligu]

Hi,
very nice the svg.

Thanks!

Merging directly on dev without review can be risky there is no rulset there as you see.
Then it also trigger the buildx on dev that pull all devs from all packages that maybe are not to publish even in the dev.
We need to coordinate a little I guess.

Maybe just wait that I see it before merging.

[robvanoostenrijk]

Thats why I didn't merge any code changes. Just documentation updates.