This does exactly what the name implies: It converts a Slack export to a series of html files so you can search/browse through your full history from Slack.
Edit the varibles to suit your system
DEBUG="0"
SRCDIR="/home/me/Downloads/SlackHistory"
DSTDIR="/home/me/SlackHistory"
RELDIR="/resources/Site/SlackHistory"
HOME="https://companyhomepage.com"
ORGNAME="Your Org Name"
./slackex2html.sh
Be Happy :)