https://manabu-nakamura.github.io/jekyll-gfm-admonitions2/, https://manabu-nakamura.github.io/jekyll-gfm-admonitions2/README2.html, https://manabu-nakamura.github.io/jekyll-gfm-admonitions2/README3.html, https://github.com/manabu-nakamura/jekyll-gfm-admonitions2
メモ
foo bar baz qux
quux