Add video demos for Phone 2a and Nothing phone 1

Added new video demos with thumbnails and links.

Author: Aleks-Levet

Demo-video-examples.md

@@ -2,9 +2,15 @@
 ## Click on the thumbnails to open the video in YouTube
 
 * Phone 2a demo:
+  
 [![Watch the video](https://img.youtube.com/vi/51qu85WXuSk/0.jpg)](https://www.youtube.com/watch?v=51qu85WXuSk)
 
+---
+
 * First early version of the script on my Nothing phone 1, I compared side by side Nothing's visualisation and mine:
+  
 [![Watch the video](https://img.youtube.com/vi/pQZAkEl7OqQ/0.jpg)](https://www.youtube.com/watch?v=pQZAkEl7OqQ)
+
+---
 
  Other videos are coming here soon!