Quay instructions require update and test

Tested Quay version is 3.8, current version in OCP 4.14 is 3.11. In that version the config-editor seems to have changed and the guide won't work anymore.
So there needs to be an overhaul for a newer version. Workaround is to install version 3.8 (still available in Operator Hub and works in 4.14)