Beni Cherniavsky-Paskin kramdown is now default https://github.com/blog/1867-github-pages-now-runs-jekyll-2-2-0  over 9 years ago

Commit id: 4369775d223d0bb613fddf972169a0891dd31c91

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# https://christopherpoole.github.io/using-mathjax-on-github-pages/  markdown: kramdown  defaults:  - scope:  path: "" # all files