Add web app manifest and icons for PWA support

- Created a new site.webmanifest file to define the web app's metadata.
- Added icons for the web app in both 192x192 and 512x512 sizes.
- Set theme color and background color to #1171e9.
- Configured the display mode to standalone.

index.html

@@ -6,6 +6,13 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Cameron B. R. Redmore - Software Developer</title>
 
+    <link rel="icon" type="image/png" href="/favicon-96x96.png" sizes="96x96" />
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+    <link rel="shortcut icon" href="/favicon.ico" />
+    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
+    <meta name="apple-mobile-web-app-title" content="cmzi.uk" />
+    <link rel="manifest" href="/site.webmanifest" />
+
     <link rel="stylesheet" href="/src/style.css">
 </head>