* Show all sections and enable cross-section focus navigation
* Move focus to the client
* Add shortcut for evaluating all cells
* Fix and expand tests
* Make section links scroll to the given section
* 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
* 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
* Set up editor and client side delta handling
* Synchronize deltas on the server
* Document the client code, add more tests
* Implement delta on the server, use compact representation when transmitting changes
* Simplify transformation implementation and add documentation
* Add session and data tests
* Add more delta tests
* Clean up evaluator tests wait timeout
