Default profile picture/avatars for people not having profile pics.

For those who don't want to keep their profile pics. Let's give them a random avatar. They can change it to their profile pic or some other avatar. But it cannot be empty.

Start by locating the profile picture rendering and the current path used when a profile picture is empty. Confirm how profile-picture changes are handled, then implement the default-avatar behavior so users without pictures always see a non-empty random avatar and can replace it with another picture or avatar.

Written by the indexing model from the issue text.