Add Open Collective link

Author: valencik

about/contribute.html

@@ -17,7 +17,7 @@ <h2>Financial Contributions</h2>
 
       <p>Maintaining an organization at the scale of Typelevel incurs costs.
       Through FOSS funding we can provide better support to maintainers, and make stronger guarantees to users, by paying for things like CI infrastructure or community support.</p>
-      <p>Any amount of support is always welcome, and we appreciate anyone who contributes to the Typelevel Open Collective.</p>
+      <p>Any amount of support is always welcome, and we appreciate anyone who contributes to the <a href=https://opencollective.com/typelevel>Typelevel Open Collective.</a></p>
 
       </br>
       <p>By funding Typelevel, you're helping us maintain our domains, infrastructure, services, and our community safety through training the Code of Conduct Committee.</p>