Optimize web config to be installed as PWA (#10405)

* Update values and add site manifest

* Use appropriate icon types

* Add purpose to all

* Adjust dark theme color

* Remove unused

web/site.webmanifest

@@ -0,0 +1,28 @@
+{
+  "name": "Frigate",
+  "short_name": "Frigate",
+  "start_url": "/",
+  "icons": [
+    {
+      "src": "/images/android-chrome-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/images/android-chrome-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "/images/apple-touch-icon.png",
+      "sizes": "180x180",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ],
+  "theme_color": "#ffffff",
+  "background_color": "#ffffff",
+  "display": "standalone"
+}