Secure Notes should have a per-note markdown option

Hi there paulpharr

If you're using pre-formatted text, like a different markup, in Secure Notes, you can escape the Markdown formatting by putting three ``` backticks at the top and bottom of the note.

Here's an example of that:

That way, everything sandwiched in those backticks will be shown verbatim with no Markdown applied, and you can still have Markdown turned on globally for all your notes.

Let me know if that would help in this case. :)

— Grey