tl;dr: CI, CD, Documentation, JS, HTML, Mermaid
I built and continue to maintain Scuttle as an open source project. The idea behind Scuttle was to add the US Web Design System to the output of Mermaid diagrams. The regular output of Mermaid diagrams wasn’t as visually pleasing as I wanted it to be and my work on USWDS was good enough for what I was trying to achieve here. I successfully implemented a Gulp plugin to process the Mermaid text kept in different files and adding it to the HTML file templates for each page.