An example of how to use the Opine Router to mount several controllers onto a
path within an application / API.
Run this example using:
deno run --allow-net --allow-read ./examples/multi-router/index.tsif have the repo cloned locally OR
deno run --allow-net --allow-read https://raw.githubusercontent.com/cmorten/opine/main/examples/multi-router/index.tsif you don't!