Lando uninstall instructions and docker

[generalredneck]

In linux, when lando installs docker, the uninstall instructions don't give you a clue on how to uninstall the docker and docker-compose instances installed by lando. I kinda expect that if lando installed docker, it should remove it, or at least give you the option to.

[reynoldsalec]

Probably a good addition to the https://docs.lando.dev/getting-started/uninstalling.html#further-cleanup section.