tune overflow behavior for brand links in footer

Author: mojavelinux

src/css/footer.css

@@ -70,6 +70,8 @@ footer.footer {
 .footer-brand-links {
   list-style: none;
   display: flex;
+  flex-wrap: wrap;
+  justify-content: center;
   margin: 2rem 0 0;
   padding: 0;
   font-size: 0.9rem;