This is a large-ish commit that adds bunch of features to the base
"tale" theme forked from https://github.com/chesterhow/tale at de5cd20.
The changes:
- custom footer
- support for sidenotes, original taken from:
https://blog.jkl.gg/jekyll-footnote-tufte-sidenote/
- logo at the top of the website
- date format is %Y-%m-%d
- The "written by" in article is only shown when article's author
differs from site author
- Pages subpage shows list of posts sorted by years
