Terminal-based markdown note manager to view statistics, explore connections and
launch editing and viewing applications.

Features
 - Present users of a zettelkasten-like note system of interlinked markdown
   files with high-level information & statistics about their notes.
 - Show the same information about filtered subsets of notes, as well as their
   relation with the entire note set.
 - Allow the user to view and follow links and backlinks of a single note to see
   connections within their note graph.
 - Allow the user to make small edits such as renaming or moving notes from
   within the application.
 - Provide easy access to a powerful, external text editor for editing notes.
 - Optionally compile notes to HTML-documents, including LaTeX compilation and
   code highlighting, on the fly and show them in an external viewer.
 - Provide all of this functionality from within a terminal user interface.
