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/widgets.yaml

@@ -0,0 +1,21 @@
+---
+# Homepage Widgets Configuration
+
+- greeting:
+    text_size: xl
+    text: TSYS Developer Support Stack
+
+- datetime:
+    text_size: l
+    format:
+      dateStyle: long
+      timeStyle: short
+
+- search:
+    provider: duckduckgo
+    target: _blank
+
+- glances:
+    url: http://localhost:4006
+    type: pihole
+    password: demo_password