Feature: integrate app icon in UI and email alerts

client/public/index.html

@@ -2,14 +2,14 @@
 <html lang="en">
   <head>
     <meta charset="utf-8" />
-    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <link rel="icon" type="image/png" href="%PUBLIC_URL%/app-icon.png" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta name="theme-color" content="#000000" />
     <meta
       name="description"
       content="SkyWatch - Infrastructure monitoring and alerting system"
     />
-    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/app-icon.png" />
     <!--
       manifest.json provides metadata used when your web app is installed on a
       user's mobile device or desktop. See https://developers.google.com/web/fundamentals/web-app-manifest/

client/public/manifest.json

@@ -3,17 +3,12 @@
   "name": "SkyWatch",
   "icons": [
     {
-      "src": "favicon.ico",
-      "sizes": "64x64 32x32 24x24 16x16",
-      "type": "image/x-icon"
-    },
-    {
-      "src": "logo192.png",
+      "src": "app-icon.png",
       "type": "image/png",
       "sizes": "192x192"
     },
     {
-      "src": "logo512.png",
+      "src": "app-icon.png",
       "type": "image/png",
       "sizes": "512x512"
     }