Slack Dark Theme
sudo wget -O /usr/lib/slack/resources/app.asar.unpacked/src/static/ssb-interop.js https://raw.githubusercontent.com/rauldipeas/custom-slack-css/master/slack-hack.js
sudo wget -O /usr/lib/slack/resources/app.asar.unpacked/src/static/ssb-interop.js https://raw.githubusercontent.com/rauldipeas/custom-slack-css/master/ssb-interop.js