fix: jpg -> white background png로 수정 (#118)

public/manifest.json

@@ -9,71 +9,66 @@
   "description": "\uc6b0\ub9ac\ub4e4\uc758 \ud074\ub77c\uc774\ubc0d \ucee4\ubba4\ub2c8\ud2f0",
   "icons": [
     {
-      "src": "icons/icon-48x48.jpg",
+      "src": "icons/icon-48x48.png",
       "sizes": "48x48",
-      "type": "image/jpg"
+      "type": "image/png"
     },
     {
-      "src": "icons/icon-72x72.jpg",
+      "src": "icons/icon-72x72.png",
       "sizes": "72x72",
-      "type": "image/jpg"
+      "type": "image/png"
     },
     {
-      "src": "icons/icon-96x96.jpg",
+      "src": "icons/icon-96x96.png",
       "sizes": "96x96",
-      "type": "image/jpg"
+      "type": "image/png"
     },
     {
-      "src": "icons/icon-128x128.jpg",
+      "src": "icons/icon-128x128.png",
       "sizes": "128x128",
-      "type": "image/jpg"
+      "type": "image/png"
     },
     {
-      "src": "icons/icon-144x144.jpg",
+      "src": "icons/icon-144x144.png",
       "sizes": "144x144",
-      "type": "image/jpg"
+      "type": "image/png"
     },
     {
-      "src": "icons/icon-152x152.jpg",
+      "src": "icons/icon-152x152.png",
       "sizes": "152x152",
-      "type": "image/jpg"
+      "type": "image/png"
     },
     {
-      "src": "icons/icon-192x192.jpg",
+      "src": "icons/icon-192x192.png",
       "sizes": "192x192",
-      "type": "image/jpg"
+      "type": "image/png"
     },
     {
-      "src": "icons/icon-192x192.jpg",
+      "src": "icons/icon-192x192.png",
       "sizes": "192x192",
-      "type": "image/jpg",
+      "type": "image/png",
       "purpose": "maskable"
     },
     {
-      "src": "icons/icon-256x256.jpg",
+      "src": "icons/icon-256x256.png",
       "sizes": "256x256",
-      "type": "image/jpg"
+      "type": "image/png"
     },
     {
-      "src": "icons/icon-384x384.jpg",
+      "src": "icons/icon-384x384.png",
       "sizes": "384x384",
-      "type": "image/jpg"
+      "type": "image/png"
     },
     {
-      "src": "icons/icon-512x512.jpg",
+      "src": "icons/icon-512x512.png",
       "sizes": "512x512",
-      "type": "image/jpg"
-    },
-    {
-      "src": "icons/icon-512x512.jpg",
-      "sizes": "512x512",
-      "type": "image/jpg",
+      "type": "image/png",
       "purpose": "maskable"
     },
     {
-      "src": "icons/icon-1024x1024.jpg",
+      "src": "icons/icon-1024x1024.png",
       "sizes": "1024x1024",
-      "type": "image/jpg"
+      "type": "image/png"
     }
   ]
 }