chore: add template intro video link

Author: hamed-shirbandi

README.md

@@ -4,7 +4,11 @@ A comprehensive SaaS application template built with the [CodeBlock Dev Kit](htt
 
 <div align="center">
   <a href="https://www.youtube.com/embed/s5PO1JIE38w" target="_blank">
-    <img src="https://codeblock.dev/images/intro.png" alt="CodeBlock Dev Kit Template Demo" width="560" height="315" style="border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1);">
+    <img src="https://codeblock.dev/images/intro.png" alt="Codeblock Dev Kit Introduction" width="280" height="157.5" style="border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1);">
+  </a>
+<span> . </span>
+  <a href="https://www.youtube.com/embed/wm54wmv-m4c" target="_blank">
+    <img src="https://codeblock.dev/images/saas-template.png" alt="CodeBlock Dev Kit's SaaS application template" width="280" height="157.5" style="border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1);">
   </a>
 </div>