website/docs: added info about creating super-users (#11356) #105

Job	Run time
lint-golint	53s
test-unittest	5m 0s
ci-outpost-mark	1s
build-container (proxy)	2m 38s
build-binary (proxy, linux, amd64)	1m 58s
build-binary (proxy, linux, arm64)	2m 19s
build-binary (ldap, linux, amd64)	2m 1s
build-container (ldap)	2m 25s
build-binary (ldap, linux, arm64)	2m 7s
build-container (radius)	2m 8s
build-binary (radius, linux, amd64)	2m 1s
build-container (rac)	2m 4s
build-binary (radius, linux, arm64)	2m 7s
build-binary (rac, linux, amd64)	1m 57s
build-binary (rac, linux, arm64)	2m 2s
	31m 41s

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