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/tutorials/adding-a-service.md

@@ -1,5 +1,5 @@
 ---
-title: adding-a-service
+title: Adding a Service
 tags:
   - tutorials
   - argocd

docs/tutorials/ai-assistance-guide.md

@@ -1,5 +1,5 @@
 ---
-title: ai-assistance-guide
+title: AI Assistance Guide
 tags:
   - tutorials
   - ai

docs/tutorials/contributing.md

@@ -1,5 +1,5 @@
 ---
-title: contributing
+title: Contributing
 tags:
   - tutorials
   - contributing

docs/tutorials/exploring-the-docs.md

@@ -1,5 +1,5 @@
 ---
-title: exploring-the-docs
+title: Exploring the Docs
 tags:
   - tutorials
   - getting-started

docs/tutorials/replicating-blumeops.md

@@ -1,5 +1,5 @@
 ---
-title: replicating-blumeops
+title: Replicating BlumeOps
 tags:
   - tutorials
   - replication

docs/tutorials/replication/argocd-config.md

@@ -1,5 +1,5 @@
 ---
-title: argocd-config
+title: ArgoCD Config
 tags:
   - tutorials
   - replication

docs/tutorials/replication/core-services.md

@@ -1,5 +1,5 @@
 ---
-title: core-services
+title: Core Services
 tags:
   - tutorials
   - replication

docs/tutorials/replication/kubernetes-bootstrap.md

@@ -1,5 +1,5 @@
 ---
-title: kubernetes-bootstrap
+title: Kubernetes Bootstrap
 tags:
   - tutorials
   - replication

docs/tutorials/replication/observability-stack.md

@@ -1,5 +1,5 @@
 ---
-title: observability-stack
+title: Observability Stack
 tags:
   - tutorials
   - replication

docs/tutorials/replication/tailscale-setup.md

@@ -1,5 +1,5 @@
 ---
-title: tailscale-setup
+title: Tailscale Setup
 tags:
   - tutorials
   - replication

docs/tutorials/tutorials.md

@@ -1,5 +1,5 @@
 ---
-title: tutorials
+title: Tutorials
 tags:
   - tutorials
 ---