* Keep track of connected clients in session data
* Add API for confirming and purging deltas
* Send delta confirmation from clients once received
* Update naming
* Fix and extend Data tests
* Update naming
* Tiny UI improvements
* Add icon for entering insert mode on a markdown cell
* Highlight selected section
* Improve contenteditable elements
* Highlight notebook/section name while editing
* Update keybindings and add help modal
* Add more evaluation shortcuts
* Add shortcut to the help modal
* Show appropriate shortcuts depending on the user system
* Handle missing user-agent header
* Conditionally render shortcut based on user agent
* Implement vim-style navigation
* Remove warning
* Determine platform based on socket on mount
* Improve shortcuts list UI
* Adjust result length
* Add more keyboard navigation actions
* Improve inserted/deleted cells focus and add some tests
* Some refactoring
* Run formatter
* Render evaluation outputs and result
* Fix auto-scrolling to not be interrupted by editor focus
* Add cell output tests
* Run formatter
* Show cell status
* Apply review suggestions
* Change EEx strings to Live EEx
* Set up markdown rendering, update theme.
* Improve focus and handle expanding for markdown cells
* Add keybindings for expanding/navigating cells
* Improve editor autofocus when navigating with shortcuts
* Add tests
* Render markdown on the client
* Don't render cell initial data and make a request instead
