Update DAG diagram to lab theme #35
Description
Update DAG visualization to match that of the lab
example:
https://drive.google.com/file/d/1RjtcpCSS1i4OsQaYpmYJN-IkGU4undut/view?usp=sharing
docs for graphviz:
https://graphviz.org/doc/info/lang.html
new layout engine?