Fix path filter, and log when excluding a file
Fix anchors for HTML
Adjust file extension of test markdown

This is to stop dokx getting confused and including it in this package's docs!
Add 'tocLevel' configuration - we want function-level table of contents

Also disable mathjax for this project; we don't want it to render the example code
Handle extra markdown files

Make mathjax optional

Handle tocLevel
Adjust __init appearance
Improve formatting for html mode
Add usage docs