break: switch from k0s to k3s (in docker)

- 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

🤖

.renovaterc.json

@@ -8,16 +8,19 @@
       "customType": "regex",
       "description": "ArgoCD",
       "fileMatch": [
-        "k0s-config\\.yaml$"
+        "^argocd-bootstrap/.*\\.yml$"
       ],
       "matchStrings": [
-        "\\s+version:\\s(?<currentValue>.*)\\s+#\\s+depName=(?<depName>.*)\\s+repoUrl=(?<registryUrl>.*)"
+       "\\s+chart:\\s(?<depName>.*)",
+       "\\s+repo:\\s(?<registryUrl>.*)",
+       "\\s+version:\\s(?<currentValue>.*)"
       ],
+      "matchStringsStrategy": "combination",
       "datasourceTemplate": "helm"
     },
     {
       "customType": "regex",
-      "description": "Baseline",
+      "description": "Baseline Manifests",
       "fileMatch": [
         "\\.jsonnet$"
       ],