I'm also interested in how you go about this. Evernote and Notion have good clippers, but I'd rather not rely on them. I tried to use markdownifier[0] for a while, but images are hotlinked and will break if the site goes down. I should really just write my own clipper that does this, but I haven't found the time yet.
I use markdown-clipper for Firefox, it does an OK job but sometimes requires a bit of fixing up. It does not save images, so I have to do this manually; I use VSCode for Markdown, which has an extension for copy/pasting images to Markdown, it inserts a link and saves the image in a subfolder.
A little friction, but if that's too much, then the article is not worth keeping. But yes, someone with the time on their hands could contribute to markdown-clipper, saving images locally.
I "print" to markdown instead, even though pdfgrep sort of works I much prefer text files.