Lesson export

[Blargian]

Hi, opening a PR for a preliminary review. I think I've got all the basic functionality working now and we can start working on making adjustments to improve it.

Added:

• An export button next to the edit button of each post
• A markdown_export.js file to save the lesson as a .md
• If a lesson has images then the images are downloaded alongside the markdown file inside a .zip

You should be able to view your markdown files by opening them in VS code and pressing ctrl + v on windows. At the moment indentation has been left out as I don't think this is supported in github markdown. I've also left the "small" heading tag as normal text for the time being.

Looking forward to getting some feedback :)

[Blargian]

Hi @jrobind, sorry about that. Yes, I'm using VS code. I missed the .editorconfig file before. Other than installing the extension editorconfig are there any other steps I need to take to make use of that file?

If you'd like I'll make a new branch, add my changes and we can try again?