Uses the power of the Diagrams Library to generate a hexagonal chessboard image (SVG) of configurable size (both image size and chessboard size)

stack build && stack exec diagramstutorial-exe should by default give out a svg of image size 800x800 of a minl = 3, maxl = 10

stack exec -- stack exec -- diagramstutorial-exe --help for info on how to pass in info via flags

Inspired by https://pritschet.me/wiki/python/example-scripts-python/2d-graphics-cairo/. Though approach to generate is completely different.