MNT: fix empty footer links

Author: jklymak

docs/_templates/landing_footer.html

@@ -44,11 +44,11 @@ <h1>matplotlib</h1>
           >Code of Conduct</a
         >
       </li>
-      <li><a href="">License</a></li>
+      <li><a href="https://matplotlib.org/stable/users/project/license.html">License</a></li>
       <li>
         <a href="https://github.com/matplotlib/governance">Governance</a>
       </li>
-      <li><a href="">NumFOCUS Fiscally Sponsored Project</a></li>
+      <li><a href="https://numfocus.org/sponsored-projects">NumFOCUS Fiscally Sponsored Project</a></li>
     </ul>
 
     <ul class="release-docs grid__release-docs">