add windows icons, optimize icons

assets/manifest.json

@@ -35,6 +35,21 @@
       "src": "icon-512.png",
       "sizes": "512x512",
       "type": "image/png"
+    },
+    {
+      "src": "icon-44.png",
+      "sizes": "44x44",
+      "type": "image/png"
+    },
+    {
+      "src": "icon-50.png",
+      "sizes": "50x50",
+      "type": "image/png"
+    },
+    {
+      "src": "icon-150.png",
+      "sizes": "150x150",
+      "type": "image/png"
     }
   ]
 }

original-assets/sailboat-icon.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="100" height="100">
+    <rect x="0" y="0" width="100" height="100" fill="#4169e1" />
+    <path d="M92.12,59.93H59.87V8.23C70.4,14.9,87.34,30,92.12,59.93ZM31,26.9A122.4,122.4,0,0,1,9.39,60.35H31ZM37.76,99H62.24A30.67,30.67,0,0,0,92.91,68.33H50.52V6.27A5.27,5.27,0,0,0,40,6.27V68.33H7.09A30.67,30.67,0,0,0,37.76,99Z" fill="#fff"/>
+</svg>