For the fellow .txt filists — I made a minimal online notepad https://kvak.io that makes it easier to access your notes anywhere. (With my wife we are also using it as an always-up-to-date shopping list).
It'd only need two pages. A list of notes, and a single page for editing notes. Perhaps a login page, but you could simplify further and just use HTTP Basic Auth. You wouldn't even need any JavaScript if you don't mind having to click a button to save your note instead of having it constantly updated as you type.