fix: Fix RHACM app project location

closes: #294

Description of changes:

Includes RHACM control plane AppProject in the rhacm-app, so that it is always added to the cluster even if the user does not add the optional argo-app application
Updates documentation to account for argo-app being an optional Application in the cluster.

Output of argocd app list command or screenshot of the Argo CD Application synchronization window showing successful application of changes in this branch.

 argocd app list
NAME                              CLUSTER                         NAMESPACE                PROJECT               STATUS  HEALTH   SYNCPOLICY  CONDITIONS  REPO                                    PATH                    TARGET
openshift-gitops/argo-app         https://kubernetes.default.svc  openshift-gitops         argocd-control-plane  Synced  Healthy  Auto-Prune  <none>      https://github.com/IBM/cloudpak-gitops  config/argocd           294-rhacm-appproject
openshift-gitops/rhacm-app        https://kubernetes.default.svc  open-cluster-management  rhacm-control-plane   Synced  Healthy  Auto-Prune  <none>      https://github.com/IBM/cloudpak-gitops  config/argocd-rhacm     294-rhacm-appproject
openshift-gitops/rhacm-cloudpaks  https://kubernetes.default.svc  openshift-gitops         rhacm-control-plane   Synced  Healthy  Auto        <none>      https://github.com/IBM/cloudpak-gitops  config/rhacm/cloudpaks  294-rhacm-appproject
openshift-gitops/rhacm-seeds      https://kubernetes.default.svc  open-cluster-management  rhacm-control-plane   Synced  Healthy  Auto        <none>      https://github.com/IBM/cloudpak-gitops  config/rhacm/seeds      294-rhacm-appproject

IBM / cloudpak-gitops

fix: Fix RHACM app project location #295