message: remove spectrum link
diff: <img alt="" src=
  "https://img.shields.io/github/last-commit/primer/components.svg">
  </a>
  - <a aria-label="join us in spectrum" href="https://spectrum.chat/?t=492cd17e-6e41-4e66-9160-2297e245b596">
  - <img alt="" src="https://withspectrum.github.io/badge/badge.svg">
  - </a>
  <a aria-label="license" href="https://github.com/primer/components/blob/master/LICENSE">
  <img src="https://img.shields.io/github/license/primer/components.svg" alt="">
  </a>
  