chore: replace mux■ icon with m■ icon (#22460)

Co-authored-by: blink-so[bot] <211532188+blink-so[bot]@users.noreply.github.com>
Co-authored-by: Jake Howell <jake@hwll.me>

site/static/icon/mux.svg

@@ -1,4 +1,11 @@
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