title: Toggle between themes with keyboard shortcut
body: <p>Is is possible to assign a keyboard shortcut for switching between themes in VSCode?</p>
  
  <p>I like Monokai or Monokai Seti for coding, but for writing documentation in Markdown I think light themes give better readability. I think this is because documentation text is mostly one color, whereas code is color highlighted for visibility.</p>
  
  <p>To me it's most important to have a light theme for Markdown preview. It would be great if the MD preview pane could have a light theme while the actual MD code is Monokai or whatever.</p>