Sign in with Maiaddy buttons
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How to use them: https://developers.maiaddy.com/guides/sign-in-with-maiaddy#the-sign-in-with-maiaddy-button

{label}-{theme}-{shape}.svg / .png / @2x.png
  label  sign-in, continue or sign-up
  theme  light, dark or blue
  shape  rect or pill
mark-{theme}-{square|circle}: the mark alone, for tight spaces. Give it the accessible name
"Sign in with Maiaddy".

Use the files as they are: don't recolour the mark, change the wording or put another mark
inside. Keep them at least 32px high, with clear space around them of at least half their height.
