docs: use krew restore-quorum command for disaster scenario
docs: use krew restore-quorum command for disaster scenario

The new krew plugin command restore-quorum will automate the process
to restore quorum from a single healthy mon. No longer do we need
the absolutely tedious, messy, manual steps from the rook docs.
The krew plugin will take care of all the complexity automatically
as of the v0.4.0 release

Signed-off-by: Travis Nielsen <a8b474fdb3f77f44446f0ab9ddca8147b09b3a9e@redhat.com>

rook/rook,rook/rook,rook/rook,rook/rook,rook/rook