📖 Update quickstart clusterctl install instructions to v0.4 #4892
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What this PR does / why we need it: Changed the clusterctl version to v0.4 in the quickstart (by changing version:"0.3.x" to version:"0.4.x") and added a warning that says if you are you using an infrastructure provider that hasn't released v1alpha4 yet, use https://release-0-3.cluster-api.sigs.k8s.io/user/quick-start.html
Which issue(s) this PR fixes (optional, in
fixes #<issue number>(, fixes #<issue_number>, ...)
format, will close the issue(s) when PR gets merged):Fixes #4888