Improve the FuncUnit.com build

You can run make to build & deploy the FuncUnit site, but the way it works seems like a hack:

• The site folder has its own Makefile and package.json, which seems odd
• At least one file is force-added unnecessarily (that whole script could probably use some attention/verification)
• Static resources are loaded from different folders, depending on which main section you’re on (i.e. the home page loads resources from site/static, while the Guides page loads from guides/static)

Home page:

Guides page: