Short story: Run this command before committing.
bash build.sh
DO NOT DIRECTLY MODIFY CSS
CSS is being compiled from Sass, but we are bundling everything into 1 file, located in assets/css/staffjoy.css. To write new CSS, write it in the appropriate .scss file located in the sass/ folder, then run gulp to build it. Gulp will watch for changes and rebuild, so you can leave it running in a separate window. Your SCSS changes will spur changes in assets/css/staffjoy.css - be sure to commit these.
If you make changes to assets or templates, you must run the following scripts to package your assets for the binary:
go-bindata assets/...
the bindata package is old and ornery, so you may need to run gofmt -s (with the simplification flag) or linting on it.