Replaced the Markdown code of conduct (conduct/conduct.md) with an HTML
version at conduct/conduct.html. Updated index.html to point to the new
published page (hack.wpi.edu/conduct/conduct.html) and removed the old
Markdown source.
Add MLH Code of Conduct at conduct/conduct.md and add a
"Code of Conduct" card to index.html linking to the document.
This provides reporting procedures, contact details, and
guidelines for event behavior.