Improve shell and m4 syntax

Julien LepillerMon Jun 28 02:19:08+0200 2021

1b603dc

gitile/assets/css
namelast commitdate
gitile.cssAdjust markdown renderingSun Jun 20 23:50:01+0200 2021
highlight.cssSupport shell and autoconf highlightingMon Jun 28 01:52:43+0200 2021