We should be accepting a Somewhat Standard Subset Of Markdown. For reference, we're using the [blackfriday](https://godoc.org/github.com/russross/blackfriday/v2) library with [CommonExtensions](https://godoc.org/github.com/russross/blackfriday/v2#CommonExtensions) enabled.
The output log should tell you where hackdoc just started listening at. Currently this is `127.0.0.1:8080` by default. You can change this by passing a `-pub_listen` flag, eg. `-pub_listen 127.0.0.1:4242`.