Install app specific gitrepos / helmrepos as part of app
Right now, we install i.e. the wordpress helm repo as part of the infrastructure kustomization. While working on !458 (merged) I made a mistake adding the wekan gitrepo, and boom, 4 kustomizations were unready: infrastructure, core, monitoring and wekan. Because the all depend on the infrastructure one.
We should rethink how we structure our dependencies, and move gitrepos / helmrepos which are only used by one app (wekan, wordpress) to the app specific kustomization at least.