Remove unused indri tags and ansible roles (#41)

## Summary
- Remove ansible roles for services migrated to k8s: devpi, kiwix, transmission
- Also remove unused node_exporter and podman ansible roles
- Remove service tags from indri for k8s-hosted services (grafana, kiwix, devpi, pg, feed)
- Update indri description to reflect current architecture

## Changes
**Ansible roles removed** (34 files, ~1000 lines):
- devpi, devpi_metrics
- kiwix
- transmission, transmission_metrics
- node_exporter
- podman

**Pulumi indri tags removed**:
- tag:grafana, tag:kiwix, tag:devpi, tag:pg, tag:feed

These services now run in k8s with their own Tailscale devices via tailscale-operator.

## Deployment and Testing
- [x] Verified remaining ansible roles match indri.yml
- [x] Verified no playbooks or role dependencies reference removed roles
- [ ] Run `pulumi preview` to verify tag changes
- [ ] Run `pulumi up` to apply tag changes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.tail8d86e.ts.net/eblume/blumeops/pulls/41

argocd/apps/kiwix.yaml

@@ -16,3 +16,9 @@ spec:
   syncPolicy:
     syncOptions:
       - CreateNamespace=true
+  # Ignore zim-hash annotation - updated dynamically by zim-watcher CronJob
+  ignoreDifferences:
+    - group: apps
+      kind: Deployment
+      jsonPointers:
+        - /metadata/annotations/kiwix.blumeops~1zim-hash