Remove JebbyGD tutorials as they are not online anymore

Author: dacap

tutorial.md

@@ -20,12 +20,6 @@ world. And we are grateful that they use Aseprite for this:
    <h3>Thanks to <a href="https://www.youtube.com/c/SadfaceRL">Sadface</a></h3>
    <iframe width="560" height="315" src="https://www.youtube.com/embed/videoseries?list=PLiWR21Q_oRcwK12QJGxWpUTy_QoPE1lTM" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
   </div>
-  <div class="col-md-6">
-    <h3>Thanks to <a href="https://www.youtube.com/channel/UCdpT9OXQsizXnc6vkhtvgEg">JebbyGD</a></h3>
-    <iframe width="560" height="315" src="https://www.youtube.com/embed/videoseries?list=PLPHvHCBMlIQ0FEEh0QM7MZlnVMoRGgUql" frameborder="0" allowfullscreen></iframe>
-  </div>
-</div>
-<div class="row">
   <div class="col-md-6">
     <h3>Thanks to <a href="https://www.youtube.com/channel/UC771Woln_1D3w1suhzXu-pw">Pixel Principles</a></h3>
     <iframe width="560" height="315" src="https://www.youtube.com/embed/?listType=playlist&list=PLUZsvE8KFU8eQUiN8WbuVuwW_i2J6tQ8r" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>