I could not test this locally, see #60. I tried to go by https://github.com/autinerd/simple-mastodon-follow-button but was not sure where to put the HTML header code — in _includes/ or _layout/ or somewhere else? Or maybe this is not needed and social network links are directly supported in minima? But this does not match what we have today in _config.yml:

So I'm a bit confused.

It looks like mastadon was added to minima 2.4 in jekyll/minima#198 in 2018. It wasn't added to the README for minima until recently so people didn't know the support existed.

I tried taking the current deployment and editing the SVG used for the twitter icon at the bottom of the main page and making it use mastadon instead but it looks like minima might bundle specific social media icons into the SVG at build time as there were only twitter, github, and RSS in the SVG image.

I also tried taking your mastadon <button and using browser developer tools to dump it into the page but I couldn't get it to work. I don't know if this is expected or not. I wonder if there is a minima-friendly way to repeat the social media icon(s) in another part of the home page/template.
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The comment appears to be interrupted. Did you mean to write another paragraph, or is the final hanging I'm a mistake?

I wonder if I had started another paragraph and then ended up adding the information in my previous paragraphs...no idea what I was trying to say.