Cerebro Release: Universal messaging format for the desktop and web version

Cerebro updates: a unified Markdown-based message format for desktop and web, with headings, links, lists, images, and @mentions.

In the new desktop and web versions, Cerebro users can insert headers, links, lists, and images and tag colleagues inside a message. We will soon implement this feature in the mobile app as well.

For this purpose, we have added a full-feature messaging text editor to the web version but have kept the simple previous version for quick messaging.

Quick messaging enabled by Ctrl+Enter (web version).