adds commands to top nav (valkey-io#19)

Signed-off-by: Kyle J. Davis <[email protected]>
(cherry picked from commit d2a0899)

Author: stockholmux

_layouts/default.html

@@ -12,6 +12,7 @@
         <nav role="navigation" aria-label="Main">
             <a role="menuitem" href="/download/">Download</a>
             <a role="menuitem" href="/docs/">Documentation</a>
+            <a role="menuitem" href="/commands/">Commands</a>
             <div class="has-submenu">
                 <span>Community</span>
                 <div class="submenu">