A Release Checklist

Delete existing files in /web
Copy over contents of the /web folder from the release zip to /temp
Copy over normal-setted font files to web directories:
- $ npm run build-supersets
Create latin subsets and copy them to *-latin directories:
- $ npm run build-subsets
Update version strings from ?v=X.XX across in _default.scss and _variable.scss files
Publish release
- $ npm version X.Y.Z (updates package.json + commits the change + makes the git tag)
- $ npm publish

Build Dependencies

Standard npm stuff
fonttools and brotli for glyphhanger, see https://github.com/zachleat/glyphhanger#prerequisite-pyftsubset