refactor(cluster)!: Update flux installation and upgrade method

Other changes include:
- Rename cluster/base to cluster/flux
- Add config and charts fluxtomizations
- Update scripts and taskfiles to reflect changes

cluster/flux/config.yaml

@@ -0,0 +1,17 @@
+---
+apiVersion: kustomize.toolkit.fluxcd.io/v1beta2
+kind: Kustomization
+metadata:
+  name: config
+  namespace: flux-system
+spec:
+  interval: 10m
+  path: ./cluster/config
+  prune: true
+  sourceRef:
+    kind: GitRepository
+    name: flux-cluster
+  decryption:
+    provider: sops
+    secretRef:
+      name: sops-age