Footnotes
Syntax: [[fn text of footnote here]]
autogenerates the footnotes at the end of the page, e.g:
Text here[[fn text of __first__ footnote here]] and more Words[[fn text of **second** footnote here]]
Text here[1] and more Words[2]
TODO:
- discuss syntax
- footnote fail if they contain a line break
- does not work with included pages