* Add cell image upload modal
* Add controller for serving the images and handle this on markdown side
* Use per-session images dir
* Add etag header to session image responses
* Adjust markdown image styling
* Properly manage session images dir
* Add tests
* Set maximum file size for image uploads
* Move images dir specifics to the Session module
* Move images when nonpersistent session becomes persistent
* Update lib/livebook_web/live/session_live.ex
Co-authored-by: José Valim <jose.valim@dashbit.co>
* Update lib/livebook_web/live/session_live.ex
Co-authored-by: José Valim <jose.valim@dashbit.co>
* Update lib/livebook_web/live/session_live/cell_upload_component.ex
Co-authored-by: José Valim <jose.valim@dashbit.co>
* Test that close gets rid of session temporary dir
Co-authored-by: José Valim <jose.valim@dashbit.co>
* Update cell actions
* Add new focus indicator
* Update headings typography
* Update cell actions and insert buttons
* Add sidebar menu
* Add settings modal
* Update homepage
* Update settings dialog
* Rename classes
* Add floating menu
* Update icon colors on hover
* Fix homepage tests
* Format assets source
* Update monaco editor
* Fix editor width on resize
* Add more padding to the notebook content
* Update settings dialog title
* Show reevaluate button when the cell is in evaluated state
* Show section actions on focus or hover only
* Pre-fill runtime selector with the current configuration
* Ignore cmd + enter in Markdown cells
* 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
* Extend LiveMarkdown format to support Elixir snippets in Markdown cells
* Highlight Markdown code blocks using Monaco editor API
* Use livebook metadata for forcing markdown as well
* 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
