I have thought about this but not found a ton of great stuff out there.
I did recently run across this while working on setting up a FOSS calendar service though: https://www.google.com/search?q=site%253Awe.riseup.net%252Ftech-autonomy%252Binfrastructure (linking google because they don't seem to be browsable on site without an account, but the individual pages are public.) It has guides for configuring, hardening and using various web infrastructure tools and open source software.
It's run by a larger organization here: https://riseup.net/
They seem to frequently link to resources (especially ansible roles) by this group: https://github.com/AnarchoTechNYC
I saw that thread too, but this narrative is such cope. I want to see it as much as anyone, and we are making progress, but idk how people got from "biden's polling dropped a good few points, this will probably cost him the election" to "nobody under 45 is going to vote for biden". I still think younger people who can't be cowed into voting for biden by the time november rolls around are in the minority (though it's incredibly heartening to see that minority grow by the day.)