feat(demo): add Homepage dashboard configuration files

- services.yaml: all 13 user-facing services organized by category
  with Pi-hole and Grafana widgets for live stats
- widgets.yaml: greeting, datetime, search, and Pi-hole glances widget
- bookmarks.yaml: developer resource links (GitHub, Stack Overflow,
  Docker Hub, Grafana Docs, InfluxDB Docs)
- settings.yaml: layout configuration (row style, column counts),
  Docker provider via socket proxy, and branding

Previously only docker.yaml existed, resulting in a bare-bones
dashboard with no widgets, bookmarks, or layout.

💘 Generated with Crush

Assisted-by: GLM-5.1 via Crush <crush@charm.land>

demo/config/homepage/settings.yaml

@@ -0,0 +1,33 @@
+---
+# Homepage Settings
+
+title: TSYS Developer Support Stack
+favicon: https://raw.githubusercontent.com/walkxcode/dashboard-icons/main/png/docker.png
+
+headerStyle: boxed
+
+layout:
+  Infrastructure:
+    style: row
+    columns: 2
+  Monitoring:
+    style: row
+    columns: 2
+  Documentation:
+    style: row
+    columns: 2
+  Developer Tools:
+    style: row
+    columns: 3
+
+providers:
+  docker:
+    socket: docker-socket-proxy:2375
+
+quicklaunch:
+  searchDescriptions: true
+  hideInternetSearch: false
+  hideVisitURL: false
+
+showStats: true
+hideVersion: false