Fix frontmatter field name: date-modified -> modified

Quartz's CreatedModifiedDate plugin recognizes `modified`, `lastmod`,
`updated`, and `last-modified` — but not `date-modified`. The wrong
field name caused Quartz to fall through to filesystem timestamps
(UTC in Dagger), showing incorrect dates on the rendered site.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/reference/services/1password.md

@@ -1,6 +1,6 @@
 ---
 title: 1Password
-date-modified: 2026-02-10
+modified: 2026-02-10
 tags:
   - service
   - secrets

docs/reference/services/alloy.md

@@ -1,6 +1,6 @@
 ---
 title: Alloy
-date-modified: 2026-02-08
+modified: 2026-02-08
 tags:
   - service
   - observability

docs/reference/services/argocd.md

@@ -1,6 +1,6 @@
 ---
 title: ArgoCD
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - service
   - gitops

docs/reference/services/automounter.md

@@ -1,6 +1,6 @@
 ---
 title: Automounter
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - services
   - macos

docs/reference/services/borgmatic.md

@@ -1,6 +1,6 @@
 ---
 title: Borgmatic
-date-modified: 2026-02-10
+modified: 2026-02-10
 tags:
   - service
   - backup

docs/reference/services/caddy.md

@@ -1,6 +1,6 @@
 ---
 title: Caddy
-date-modified: 2026-02-08
+modified: 2026-02-08
 tags:
   - service
   - networking

docs/reference/services/devpi.md

@@ -1,6 +1,6 @@
 ---
 title: Devpi
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - service
   - python

docs/reference/services/docs.md

@@ -1,6 +1,6 @@
 ---
 title: Docs
-date-modified: 2026-02-08
+modified: 2026-02-08
 tags:
   - service
   - documentation

docs/reference/services/flyio-proxy.md

@@ -1,6 +1,6 @@
 ---
 title: Fly.io Proxy
-date-modified: 2026-02-08
+modified: 2026-02-08
 tags:
   - service
   - networking

docs/reference/services/forgejo.md

@@ -1,6 +1,6 @@
 ---
 title: Forgejo
-date-modified: 2026-02-08
+modified: 2026-02-08
 tags:
   - service
   - git

docs/reference/services/grafana.md

@@ -1,6 +1,6 @@
 ---
 title: Grafana
-date-modified: 2026-02-08
+modified: 2026-02-08
 tags:
   - service
   - observability

docs/reference/services/immich.md

@@ -1,6 +1,6 @@
 ---
 title: Immich
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - service
   - media

docs/reference/services/jellyfin.md

@@ -1,6 +1,6 @@
 ---
 title: Jellyfin
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - service
   - media

docs/reference/services/kiwix.md

@@ -1,6 +1,6 @@
 ---
 title: Kiwix
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - service
   - knowledge

docs/reference/services/loki.md

@@ -1,6 +1,6 @@
 ---
 title: Loki
-date-modified: 2026-02-08
+modified: 2026-02-08
 tags:
   - service
   - observability

docs/reference/services/miniflux.md

@@ -1,6 +1,6 @@
 ---
 title: Miniflux
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - service
   - rss

docs/reference/services/navidrome.md

@@ -1,6 +1,6 @@
 ---
 title: Navidrome
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - service
   - media

docs/reference/services/postgresql.md

@@ -1,6 +1,6 @@
 ---
 title: PostgreSQL
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - service
   - database

docs/reference/services/prometheus.md

@@ -1,6 +1,6 @@
 ---
 title: Prometheus
-date-modified: 2026-02-08
+modified: 2026-02-08
 tags:
   - service
   - observability

docs/reference/services/teslamate.md

@@ -1,6 +1,6 @@
 ---
 title: TeslaMate
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - service
   - vehicle

docs/reference/services/transmission.md

@@ -1,6 +1,6 @@
 ---
 title: Transmission
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - service
   - torrent

docs/reference/services/zot.md

@@ -1,6 +1,6 @@
 ---
 title: Zot
-date-modified: 2026-02-07
+modified: 2026-02-07
 tags:
   - service
   - registry