Squashed 'themes/graphite/' changes from e7210f0..1399275

1399275 Added footnotes styling and some configuration

git-subtree-dir: themes/graphite
git-subtree-split: 139927514cfdad58d8134e310d9d6ea497d8b394
Merge commit '254ed12cd7a12e8f2f82a4f7d353acb8a3c22039'
Added posts and updated heading prefix

This commit changes the heading prefix to a ticked box, which seemed
more appropriate. Also, some of the Feb posts had been incorrectly
placed in the `jan` folder - this post moves them.