Hub Notes

Hub notes are a way to systemitize knowledge. They include mostly links to other things that are derivatives or subsets of the hub note topic. Here's an example:

A hub note might contain 'Functional Programming Languages' and link to several language topics 'Haskell', 'F*', etc. where each of those might also be a hub note.

Hub notes are supposed to be a map in a sense of all the notes they contain.