Add licenses

src/layouts/partials/footer.ejs

@@ -27,14 +27,14 @@
       Except where otherwise noted, content on this site is © 2014-2023
       <a
         xmlns:cc="http://creativecommons.org/ns#"
-        href="<%=site.author.uri%>"
+        href="<%=site.author.uri ?? '/'%>"
         property="cc:attributionName"
         rel="cc:attributionURL">
         <%=site.author.name%></a>,
       and is licensed under a
       <a
         rel="license"
-        href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.
+        href="/licenses/cc-by-sa.html">Creative Commons Attribution-ShareAlike 4.0 International License</a>.
     </p>