remove check for outdated siteRootUrl property [skip ci]

Author: mojavelinux

src/partials/footer-content.hbs

@@ -6,7 +6,7 @@
     </figure>
     <ul class="footer-brand-links">
       <li><a href="https://asciidoctor.org" target="_blank" rel="noopener">Home</a></li>
-      <li><a href="{{{or site.url (or siteRootUrl siteRootPath)}}}">Docs</a></li>
+      <li><a href="{{{or site.url siteRootPath}}}">Docs</a></li>
       <li><a href="https://asciidoctor.zulipchat.com" target="_blank" rel="noopener">Chat</a></li>
       <li><a href="https://discuss.asciidoctor.org" target="_blank" rel="noopener">List</a></li>
       <li><a href="https://github.com/asciidoctor" target="_blank" rel="noopener">Source</a></li>