Make it possible to help with sysadmin

We’ve identified sysadmin as an area where we could benefit the most from new contributors. We should make it possible for new contributors to help us.

Subtasks

#6182 (closed)
#5500 (closed)

Related issues

Related to #6056 (closed)
Related to #6920 (closed)
Related to #6921
Related to #5683 (closed)
Related to #6922
Related to #6927

Original created by @intrigeri on 6181 (Redmine)

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information