Add output SVG to repo

[Charles Horn]

All generated SVG should validate against https://validator.w3.org/

Ideally the .html alphabet layout file would be viewable on github. This might be difficult, without setting up a separate github pages site. It looks like MD can link and display SVG files though (now), so that could be an option. See https://github.com/potherca-blog/StackOverflow/tree/master/question.13808020.include-an-svg-hosted-on-github-in-markdown