Some client html meta updates, apple standalone

Resolves #214

client/index.html

@@ -5,8 +5,9 @@
     <link rel="icon" href="/favicon.svg" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta name="theme-color" content="#DC7734" />
-    <meta name="description" content="Spoolman UI" />
+    <meta name="description" content="Spoolman - Keep track of your inventory of 3D-printer filament spools." />
     <meta name="robots" content="noindex,nofollow" />
+    <meta name="apple-mobile-web-app-capable" content="yes" />
     <title>Spoolman</title>
   </head>
 

client/public/manifest.json

@@ -1,13 +1,22 @@
 {
   "name": "Spoolman",
   "short_name": "Spoolman",
+  "description": "Keep track of your inventory of 3D-printer filament spools.",
   "icons": [
     {
-      "src": "google-touch-icon.png",
-      "sizes": "512x512"
+      "purpose": "maskable",
+      "sizes": "512x512",
+      "src": "icon512_maskable.png",
+      "type": "image/png"
+    },
+    {
+      "purpose": "any",
+      "sizes": "512x512",
+      "src": "icon512_rounded.png",
+      "type": "image/png"
     }
   ],
-  "background_color": "#ffffff",
+  "background_color": "#1F1F1F",
   "theme_color": "#DC7734",
-  "display": "fullscreen"
+  "display": "standalone"
 }