* Overhaul the Slack integration * Docstring * Empty commit to re-trigger build * Remove remote file option * Remove unused function * Adjust log message * Update homeassistant/components/slack/notify.py Co-Authored-By: Paulus Schoutsen <paulus@home-assistant.io> * Code review * Add deprecation warning Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>