The lesson from this markdown file is that if your partner can’t figure this stuff out on their own you need to sort it out yesterday. I doubt that the information being open source or being in markdown format is going to help out your partner whatsoever.
There's an increasing number of single people and lone-livers.
> if your partner can’t figure this stuff out on their own you need to sort it out yesterday.
I don't know how common it is, but I know there are some couples who just don't think of this kind of stuff, at all, until it's too late.
Mostly I've heard of it through a sudden death - the other person now has to figure out what and how all the things are paid for and handled.
I know of another where one partner got ownership of a small business after a divorce, but had no idea how to handle personal or business taxes/paperwork/etc. Had never done much more than sign their name under tax records, or whatever - and suddenly had to figure out all of that on their own.
Of course, using your logic, getting is sorted "yesterday" could mean sitting down and having your loved one understand how to access all this data using MD. Even better would be to have them build the data up with you.