I'm using Org Mode to fill these pages with life. It's older than Markdown, has only a single flavour and built into Emacs.
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=fixed-width=mode by delimiting it with = signs. To have a literal = in the text without interrupting the syntax, you have to insert a Zero Width Space as an Escape Character in front of the literal =
C-x 8 <RET> zero width space <RET>