Lab step change for JWT creation

Lab participant stated: 

JWT.io changed their site for creating the JWT token and requires the encoder tab.  
-- No longer encodes base64 and will require to create a base64 encoded string yourself.  

<img width="683" alt="Image" src="https://github.com/user-attachments/assets/6382e7d7-a2b4-4fdf-a917-7c0c101afbca" />