Update Editor Markdown

[milaiwi]

The current markdown is very barebones. Unfortunately, there does not exist a library that easily solves these issues. A good editor should be able to do the following:

• Numbered lists should be indented
• Should be able to dynamically change the heading level of a markdown by deleting or adding a hash. Right now, you cannot remove hashes.
• Drag-and-drop to upload images and gifs. Should given option for resizing and alignment
• Support for collapsible sections on headers
• Version control

Feel free to leave more suggestions!

[Dogway]

I use MarkText, superb MarkDown editor. It ticks all checkboxes and more.
For the time being I think it would be nice to point to MarkText or your editor of choice in reor. No need to reinvent the wheel.

[divyamrastogi]

@Dogway : Can you point out how to use MarkText with Reor?