Improve post-wiki setup.

[config] / systemfiles / post-update

#!/bin/sh
LIFELOGDIR=/home/plom/lifelog
GIT_WORK_TREE=$LIFELOGDIR git checkout -f
find $LIFELOGDIR -name "*.rst" -type f -exec sh -c 'pandoc -s -f rst --mathml -t html5 $0 > ${0%.rst}.html' {} \;