offcanvas-navbar: add missing redirect (#33443)

Author: XhmikosR

site/content/docs/5.0/examples/offcanvas-navbar/index.html

@@ -6,6 +6,7 @@
 extra_js:
   - src: "offcanvas.js"
 body_class: "bg-light"
+aliases: "/docs/5.0/examples/offcanvas/"
 ---
 
 <nav class="navbar navbar-expand-lg fixed-top navbar-dark bg-dark" aria-label="Main navigation">