Once upon a time these were usually posts on one own blog (self-hosted or not), started with a HOWTO keyword and helped the people just in the same way. Nowadays everything developer must be on GitHub or it won't ever be noticed.
I host my blog using GitHub pages and hugo. Its all still markdown, but it also allows people to go to my vanity url and see stuff formatted exactly as I want it to be.
/Old man yells at clouds