Fix: '.md' to '.html' with anchors (fixes #1415)

Markdown documentation can now reference another markdown file with an anchor and it will work for the site along with github.
ex. `working-with-rules.md#rule-unit-tests`
Merge pull request #1417 from Nate-Wilkins/patch-1

Fix: '.md' to '.html' with anchors (fixes #1415)