Update all docs titles to human-readable (#117)

## Summary
- Updated frontmatter `title:` in all 63 doc cards from slug-case to human-readable (e.g. `borgmatic` → `Borgmatic`, `ai-assistance-guide` → `AI Assistance Guide`)
- Titles now closely match file stems so `[[wiki-links]]` render naturally without alternate anchor text
- Corrected titles that diverged from stems (e.g. `host-inventory` → `Hosts`, `grafana-alloy` → `Alloy`, `argocd-applications` → `Apps`)
- Deleted `title-test-alpha.md` and `title-test-beta.md` test cards and removed their reference index entry

## Deployment and Testing
- [x] `docs-check-links` passes — all wiki-links valid
- [x] `docs-check-index` passes
- [x] `docs-check-filenames` passes
- [ ] Verify titles render correctly on docs site after deploy

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/117

docs/how-to/add-ansible-role.md

@@ -1,5 +1,5 @@
 ---
-title: add-ansible-role
+title: Add Ansible Role
 tags:
   - how-to
   - ansible

docs/how-to/deploy-k8s-service.md

@@ -1,5 +1,5 @@
 ---
-title: deploy-k8s-service
+title: Deploy K8s Service
 tags:
   - how-to
   - kubernetes

docs/how-to/gandi-operations.md

@@ -1,5 +1,5 @@
 ---
-title: gandi-operations
+title: Gandi Operations
 tags:
   - how-to
   - dns

docs/how-to/how-to.md

@@ -1,5 +1,5 @@
 ---
-title: how-to
+title: How-To
 tags:
   - how-to
 ---

docs/how-to/knowledgebase/review-documentation.md

@@ -1,5 +1,5 @@
 ---
-title: review-documentation
+title: Review Documentation
 tags:
   - how-to
   - documentation

docs/how-to/restart-indri.md

@@ -1,5 +1,5 @@
 ---
-title: restart-indri
+title: Restart Indri
 tags:
   - how-to
   - operations

docs/how-to/troubleshooting.md

@@ -1,5 +1,5 @@
 ---
-title: troubleshooting
+title: Troubleshooting
 tags:
   - how-to
   - operations

docs/how-to/update-documentation.md

@@ -1,5 +1,5 @@
 ---
-title: update-documentation
+title: Update Documentation
 tags:
   - how-to
   - documentation

docs/how-to/update-tailscale-acls.md

@@ -1,5 +1,5 @@
 ---
-title: update-tailscale-acls
+title: Update Tailscale ACLs
 tags:
   - how-to
   - tailscale

docs/how-to/use-pypi-proxy.md

@@ -1,5 +1,5 @@
 ---
-title: use-pypi-proxy
+title: Use PyPI Proxy
 tags:
   - how-to
   - python