Release notes:

Added line numbers to navigation bar.
Changed comment keyword to //. The Comment keyword is changed to better represent comments in modern coding languages like javascript.
Changed Header navigation prefix to #. This way it more accuratly represents the header.
Page keybind have been updated. The page keybinds have been updated and it's now easier to navigate using the Page keybinds in combination with the Marker keybinds.
The Splash Screen has been updated to represent the current state of the project. The Splash screen is now also callable in the menubar.
Your current theme is visible in the status bar. Is off by default. You can turn this on by clicking Toggle Show Active Theme under themes or by pressing CmdOrCtrl + T.
The Active Page now has a / prefix as shown in screenshots of previous versions of Left.
Changed styling of comment markers in the navigation bar.
moved context menu to body
Fixed: unclickable area at top of screen
Fixed: Fixed saving theme to localstorage
Added some features to improve file lifecycle: default filenames and extensions, default pagenames and slowed down reader speed