Request: Code Example Menu

[qjcg]

First of all, a big thank you to all contributors for the amazing work to date on this excellent project!

A humble feature request: consider adding a menu that changes the code sample.

So for example, you could select "Haskell" via this menu to get a Haskell code snippet in the main text area, and then if you used the same menu to then select "Go", the main text area would be updated to display a Go code example. This would make it much more ergonomic (vs copying and pasting several different language examples) for those of us wanting to see how our favorite languages look in a variety of fonts.