docs: added slide qr

Signed-off-by: Neko Ayaka <[email protected]>

Author: nekomeowww

packages/2024-08-21-kubecon-hk/public/slide_qr.png

@@ -1724,6 +1724,9 @@ class: py-10
     <div>
       Slides built on top of <a href="https://sli.dev"><div inline-block mr-1 translate-y-0.8 i-logos:slidev />sli.dev</a>
     </div>
+    <div self-end mt-16 translate-x-6>
+      <img src="/public/slide_qr.png" w-50 />
+    </div>
   </div>
 </div>