v0.13.0

What's Changed

• Add token and repo env variables to build step by @dunkmann00 in #19
• New features and some maintenance by @dunkmann00 in #20

This has two primary new features:

Add option to disable heading on home page via config
Add support for copy button in code blocks (like on GitHub)
The heading may not be desirable when you are already including a heading. This can be true with Readmes if you already have the title in the Readme. With this PR, you can turn off the heading, for the home page only (which is what the Readme is turned into as the index.html for a repo) through setting home_heading in _config.yml.

Copy button in code blocks needs no pitch, write a code block, get a copy button, boom 🤯

Full Changelog: v0.12.0...v0.13.0