refactor: rename k8s-manifests directory to manifests

- Rename all `k8s-manifests` subdirectories and files to `manifests`
- Update all file paths in `argocd-init.yml` to reflect the new directory name

🤖

k8s-manifests/monitoring/prometheus-stack.jsonnet

@@ -1,47 +0,0 @@
-# see https://blog.ediri.io/kube-prometheus-stack-and-argocd-23-how-to-remove-a-workaround
-local app = import "../../_templates/argocd_app.libsonnet";
-
-local vars = {
-	"version": "48.2.3",
-	"namespace": "metrics"
-};
-
-[
-app + {
-  name:: "prometheus-crds",
-  namespace:: vars.namespace,
-  path:: "charts/kube-prometheus-stack/charts/crds/crds",
-  repo:: "https://github.com/prometheus-community/helm-charts.git",
-  version:: "kube-prometheus-stack-" + vars.version,
-  syncOptions:: ["CreateNamespace=true", "Replace=true"],
-  sync_wave:: -1,
-},
-app + {
-  name:: "prometheus-grafana",
-  namespace: vars.namespace,
-  chart:: "kube-prometheus-stack",
-  repo:: "https://prometheus-community.github.io/helm-charts",
-  version:: vars.version,
-  skipCrds:: true,
-  values:: |||
-    fullnameOverride: prometheus-stack
-    kubeProxy:
-      enabled: false
-    kubeScheduler:
-      enabled: false
-    kubeControllerManager:
-      enabled: false
-    alertmanager:
-      enabled: false
-    prometheus:
-      prometheusSpec:
-        storageSpec:
-          volumeClaimTemplate:
-            spec:
-              accessModes: ["ReadWriteOnce"]
-              resources:
-                requests:
-                  storage: 10Gi
-  |||
-}
-]