Add YouTube link to sidebar

Author: csswizardry

_includes/sub-content.html

@@ -56,6 +56,7 @@ <h4>Connect</h4>
   <li><a href="https://bsky.app/profile/csswizardry.com">Bluesky</a></li>
   <li><a href="https://www.linkedin.com/in/csswizardry/">LinkedIn</a></li>
   <li><a href="https://github.com/csswizardry">GitHub</a></li>
+  <li><a href="https://www.youtube.com/@csswizardry?sub_confirmation=1">YouTube</a></li>
 </ul>
 
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