Improve GNOME Disks instructions

• Explain that GNOME Disks is also called Disks, or the other way around [62]
  • Add logo for GNOME Disks [62]
  • Add menu path for GNOME Disks [62]
  • Test whether formatting can prevent people clicking on the double gear [64]
  • Circle gear button in GNOME Disks screenshot [64]

Feature Branch: web/10629-gnome-disks

Parent Task: #8590 (closed)

Related issues

• Related to #5323 (closed)

Original created by @sajolida on 10629 (Redmine)