Resolve "Update docs to mention the need for logging into Harbor before running umbrella"

Summary

(Summarize the purpose of the MR)

Relevant logs/screenshots

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/cc @someoneelse

Closes #19 (closed)

.vscode/settings.json

-{
-    "cSpell.words": [
-        "AWSINSTANCEID",
-        "AWSUSERNAME",
-        "Grafana",
-        "Kiali",
-        "Kibana",
-        "Kustomization",
-        "Kustomizations",
-        "Kustomize",
-        "MYBOUNDARY",
-        "Twistlock",
-        "YOURLOCALPUBLICIP",
-        "YOURPUBLICEC",
-        "authservice",
-        "awscliv",
-        "bigbangdev",
-        "bigbangkey",
-        "certmanager",
-        "chmod",
-        "configmap",
-        "configmaps",
-        "containerd",
-        "coredns",
-        "evalsymlink",
-        "fetchingref",
-        "finalizers",
-        "fluentbit",
-        "fluxcd",
-        "fluxv",
-        "gitops",
-        "gitrepositories",
-        "gitrepository",
-        "gnupg",
-        "hashicorp",
-        "helmrelease",
-        "helmreleases",
-        "istio",
-        "keyserver",
-        "keysize",
-        "kube",
-        "kubeapi",
-        "loadbalancer",
-        "mkdir",
-        "nofile",
-        "noout",
-        "registrycredentials",
-        "repos",
-        "rmescandon",
-        "runc",
-        "sysconfig",
-        "traefik",
-        "updatekeys",
-        "userdata",
-        "usermod",
-        "windir",
-        "xlarge"
-    ]
-}
\ No newline at end of file