Change YouTube URL to embed format

Updated YouTube URL format for a calendar event.

Author: SamanthasCodes

_data/calendar.yaml

@@ -37,7 +37,7 @@
         title: 'Digital Neural Organoids: Biologically-Inspired Learning Objects'
         speakers:
         - John Van Horn
-        youtube_url: https://youtu.be/S6f4pDo6Gio?si=vVdw5f6-om2_3WCQ
+        youtube_url: https://www.youtube.com/embed/S6f4pDo6Gio?si=0afD29bpXVm2OB87
       - time: 5:00pm
         title: 'Welcome Reception and Dinner'
         speakers: []