message: docs(readme): add pre-commit badge to top level readme
diff: <p align="center"><b>Speckle</b> is data infrastructure for the AEC industry.</p><br/>
  <p align="center"><a href="https://twitter.com/SpeckleSystems"><img src="https://img.shields.io/twitter/follow/SpeckleSystems?style=social" alt="Twitter Follow"></a> <a href="https://speckle.community"><img src="https://img.shields.io/discourse/users?server=https%3A%2F%2Fspeckle.community&amp;style=flat-square&amp;logo=discourse&amp;logoColor=white" alt="Community forum users"></a> <a href="https://speckle.systems"><img src="https://img.shields.io/badge/https://-speckle.systems-royalblue?style=flat-square" alt="website"></a> <a href="https://speckle.guide/dev/"><img src="https://img.shields.io/badge/docs-speckle.guide-orange?style=flat-square&amp;logo=read-the-docs&amp;logoColor=white" alt="docs"></a></p>
  -<p align="center"><a href="https://github.com/Speckle-Next/SpeckleServer/"><img src="https://circleci.com/gh/specklesystems/speckle-server.svg?style=svg&amp;circle-token=76eabd350ea243575cbb258b746ed3f471f7ac29" alt="Speckle-Next"></a> <a href="https://codecov.io/gh/specklesystems/speckle-server"><img src="https://codecov.io/gh/specklesystems/speckle-server/branch/master/graph/badge.svg" alt="codecov"></a></p>
  +
  +<p align="center">
  +<a href="https://github.com/Speckle-Next/SpeckleServer/"><img src="https://circleci.com/gh/specklesystems/speckle-server.svg?style=svg&amp;circle-token=76eabd350ea243575cbb258b746ed3f471f7ac29" alt="Speckle-Next">
  +</a>
  +<a href="https://codecov.io/gh/specklesystems/speckle-server">
  +<img src="https://codecov.io/gh/specklesystems/speckle-server/branch/master/graph/badge.svg" alt="codecov">
  +</a>
  +<a href="https://results.pre-commit.ci/latest/github/specklesystems/speckle-server/main">
  +<img src="https://results.pre-commit.ci/badge/github/specklesystems/speckle-server/main.svg" alt="codecov">
  +</a>
  +</p>
  # About Speckle
  