Document how to start Tails from an external hard drive or SSD
On #16926 (closed) we reached the conclusion that it's worth documenting this (remove live-media=removable) until #6397 is implemented.
Incidentally, the same instructions would work for booting from a virtual or physical USB drive in VirtualBox.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information