A favicon is a small image displayed next to the page title in the browser tab. The Simple Web Server introduced via https://openjdk.java.net/jeps/408 in Java 18 does not provide a favicon by default.

Let's enhance the Simple Web Server to provide an overridable Duke image as a favicon by default.

Websites like jdk.java.net and inside.java already do provide such favicons:
- https://jdk.java.net/images/nanoduke.ico (16x16)
- https://inside.java/images/favicon.ico (48x48)