@vasta Good point! I occasionally try to bring Drafts into my workflow, and then promptly forget about it again. You are right, this sort of problem is exactly what Drafts has been designed to solve.
@canion Late! I was also going to suggest Drafts. The good thing is if you select some text in Safari and select Drafts from the share sheet you'll get the Markdown URL and the selected text, which you can add to and save as a new Draft.