Pandoc[1] is the tool you need. Extremely simple to use, even more if you start with posts written in markdown, and you can generate any format known to man.<p>[1] <a href="https://pandoc.org/" rel="nofollow">https://pandoc.org/</a>
I had a similar problem and I built this <a href="https://github.com/alexadam/save-as-ebook" rel="nofollow">https://github.com/alexadam/save-as-ebook</a> You can add web pages as chapters and it generates an .epub
I dont know how much of this you want to do yourself, but i would copy the text into a docx file and convert that to mobi using e.g. calibre. Or are you looking to automate it? I'd probably use a python library for making epubs in that case.
I'm about to deploy a new version of eink.news.<p>We create a new ebook every few hours or days depending on the blog cadency.<p>It does exactly what you want although we just support HN and IH(indiehackers) for the moment.<p>You can contribute and create a new parser for the blogs you are interested in. The parsing modules are open source :)
I remember someone launching pg2epub.com here on HN. Maybe reach out to the guy who did it and see if he is willing to give out the code? I clip all of the good articles to Evernote (via their web-clipper) maybe you can do the same and then export it out to PDF. Hope this helps!
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