docs: provide link for crc documentation
docs: provide link for crc documentation

CRC aka code ready containers provide openshift cluster 4.x in a single host machine
Signed-off-by: Jiffin Tony Thottan <ac134a614b50f2e879db85acb9f4b45b24a210dc@gmail.com>

rook/rook,rook/nfs,rook/rook,rook/nfs,rook/rook,rook/nfs,rook/rook,rook/rook