feat: add favicon (#83)

The favicon used was created with
[favicon.io](https://favicon.io/emoji-favicons/globe-with-meridians/)
and the 🌐 emoji.
An alternative would be to use something like
[piskel](https://www.piskelapp.com/p/create/sprite) to create a 48x48
sprite, and turn that into a favicon.

Author: MegaRedHand

src/assets/favicon.ico

@@ -11,6 +11,7 @@ module.exports = {
   plugins: [
     new HtmlWebpackPlugin({
       title: "Development",
+      favicon: "./src/assets/favicon.ico",
     }),
   ],
   output: {