Switch to kramdown for footnote support.
Footnotes with style.
Revert "Footnotes with style."

It didn't 'just work' so I'll figure them out later.

This reverts commit 1102e30ab0d459ca87f339f151b6807fa6e54fa5.
First draft of my Markdown cheat sheet.
Move comments to only the post pages.
Format tables so they look pretty.
Rejig footnotes a little and update for kramdown.
Add a new excerpt and ... publish.