chore: update og:image

Author: jvalen

public/index.html

@@ -21,7 +21,7 @@
     />
     <meta
       property="og:image"
-      content="http://www.jvalen.com/pixelarttocss/logo-pixelarttocss.png"
+      content="https://raw.githubusercontent.com/jvalen/pixel-art-react/master/screenshots/tree-pixelartcss.png"
     />
     <link rel="apple-touch-icon" href="apple-touch-icon.png" />
     <link rel="icon" type="image/png" href="regular-icon.png" sizes="192x192" />