WIP - MTA: Build asciidoc previews

[anarnold97]

DONE

• adding workflow to build docs from AsciiDoc: checkout code, use the asciidoctor-action to build the docs directory, and then write a CNAME file so it’s got a friendly URL

TO DO

• add a makefile: use a makefile, so we can just use the make command to make our docs.

[anarnold97]

Suggested change

	program: "asciidoctor -D docs -a stylesheet=style.css --backend=html5 -o index.html README.adoc && echo 'docs.upsilonproject.io' > docs/CNAME"
	program: "asciidoctor -D docs -a stylesheet=style.css --backend=html5 -o index.html README.adoc && echo 'mta-documentation.io' > docs/CNAME"