We wanted a way to increase the findability of required elements in
addition the the "required" badge on the element's information box.
This styles the button in the module grouping as well.
I got rid of these when initially trying to group the elements for
each module together under their clusters, but actually now there
are less elements so we can keep this bubble style. A bonus is that
we don't need to figure out how to delimit by comma in Hugo's Go
templates (the last one is always tricky).
After running the util/generate_docs.py script to parse and extract
the metadata term specifications and their controlled vocabularies,
we use Hugo to generate the HTML site. The HTML site uses Bootstrap
with several ISEAL brand colors gleaned from the corporate website.