Fix doc urls

docs/documentation.html

@@ -6,8 +6,10 @@ subtitle: Everything you need to create a website with Bulma.
 hero_prints:
 - label: "Creative Commons"
   icon: "fab fa-creative-commons"
+  url: https://creativecommons.org/licenses/by-nc-sa/4.0/
 - label: "Contribute on GitHub"
   icon: "fas fa-code-pull-request"
+  url: https://github.com/jgthms/bulma
 ---
 {% assign category_ids = site.data.links.category_ids %}