Fix unstyled link

Author: matteason

pages/index.vue

@@ -50,7 +50,7 @@
             <div class="govuk-grid-column-two-thirds govuk-!-mb-r4">
               <h2 class="govuk-heading-l">Sponsoring GOV.UK Vue</h2>
               <p class="govuk-body">
-                GOV.UK Vue is built and maintained by <a href="https://github.com/matteason">Matt Eason</a> as
+                GOV.UK Vue is built and maintained by <a href="https://github.com/matteason" class="govuk-link">Matt Eason</a> as
                 a community resource. It's not maintained or supported by GDS.
               </p>
               <p class="govuk-body">