feat: add favicon and web app manifest for improved PWA support

Author: mstrhakr

_includes/head_custom.html

@@ -1,3 +1,11 @@
+<!-- Favicon -->
+<link rel="icon" type="image/svg+xml" href="{{ '/assets/images/icon.svg' | relative_url }}">
+<link rel="apple-touch-icon" href="{{ '/assets/images/icon.svg' | relative_url }}">
+
+<!-- Web App Manifest for Android/Chrome install -->
+<link rel="manifest" href="{{ '/site.webmanifest' | relative_url }}">
+<meta name="theme-color" content="#1e1e1e">
+
 <style>
 /* Fix SVG sizing - SVGs need explicit dimensions via inline styles */
 /* Footer logo sizing */

site.webmanifest

@@ -0,0 +1,17 @@
+{
+  "name": "Plugin Development Docs for Unraid®",
+  "short_name": "Unraid Plugin Docs",
+  "description": "Community-maintained documentation for building plugins for Unraid®",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#1e1e1e",
+  "theme_color": "#1e1e1e",
+  "icons": [
+    {
+      "src": "/assets/images/icon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "any maskable"
+    }
+  ]
+}