Update onyx (using stylus browser addon...)

This adds the allimportant.sh helper for epiphany user-stylesheet

resources/css/allimportant.sh

+#!/bin/sh
+
+# needed for epiphany userscript because it apparently does not
+# have the same priority as firefox/chrome userscripts?
+cat whatsapp.css | sed -r 's/!important//;s/ ?;/ !important;/'