Draw a network map

[Svedrin]

Now that we know all the hops, we could draw a graph of some sort to display a network map.

Maybe generate some PlantUML and let it handle the dirty work of actually drawing the thing:

• https://plantuml.com/nwdiag
• https://crashedmind.github.io/PlantUMLHitchhikersGuide/NetworkUsersMachines/NetworkUsersMachines.html

It seems if we want items to be clickable (so you can directly jump to their histogram for targets), we need to render as svg: https://github.com/asciidoctor/asciidoctor-pdf/issues/1521