website/layouts/shortcodes/github.html

<a id="github-counter" class="btn btn-lg btn-dark font-weight-bold" href="https://github.com/aws/karpenter">
    <i class="fab fa-github"></i>
    GitHub
</a>
<script>
  url = "https://api.github.com/repos/aws/karpenter-provider-aws"
  fetch(url).then(function(response) {
    return response.json();
  }).then(function(data) {
    stars = data.stargazers_count;
    var element = document.getElementById("github-counter");
    element.innerHTML = `<i class="fab fa-github"></i> Stars on Github: ${stars}`;
  })
</script>