chore(site): update copyright year to 2026

Author: kt3k

source/layout/layout.njk

@@ -32,7 +32,7 @@
         <nav>
           <ul>
             <li>
-              <small>© 2016 {{ orgName }}</small>
+              <small>© 2026 {{ orgName }}</small>
             </li>
           </ul>
           <ul>