Providing some (not so) useful tikz snippets done sometimes for something. Sharing is caring.
Running make
in the one of the subdirectories will build
a PDF containing the tikzpicture (assuming lualatex
is installed).
Using \usepackage{standalone}
in the preamble of your latex project gives
you the ability to \input{main.tex}
the tikzpicture of your choice.