break: switch from k0s to k3s

- replace k0s with k3s in docker-compose.yml
- remove k0s-config.yaml
  - remove metallb-address-pool
- update .renovaterc.json to match new file structure
- add new argocd-init files for k3s
- update README to reflect changes

🤖

manifests/metallb-address-pool.yml

@@ -1,10 +0,0 @@
----
-apiVersion: metallb.io/v1beta1
-kind: IPAddressPool
-metadata:
-  name: metallb-address-pool
-  namespace: metallb
-  annotations:
-spec:
-  addresses:
-  - 194.55.14.183/32