Update prerequisites with google form link

prerequisites.md

@@ -10,7 +10,7 @@ An Earthdata Login account is required to access data, as well as discover restr
 
 ### 2. GitHub Account
 
-A GitHub account is required to gain access to the provided 2i2c cloud computing platform. Please visit https://github.com/join to register and create a free GitHub account. Make sure you have sent your username to the workshop leaders once you have done so for access to our cloud computing environment. 
+A GitHub account is required to gain access to the provided 2i2c cloud computing platform. Please visit https://github.com/join to register and create a free GitHub account. Make sure you have sent your username to the workshop leaders via this [Google Form](https://docs.google.com/forms/d/e/1FAIpQLSfir0YIPhY5AJ6lpO1qOo-Wm1gjl7nXPasPjTKD3OCIhQo82A/viewform?usp=sf_link) once you have done so for access to our cloud computing environment. 
 
 ### 3. Laptop or tablet
-Participation in the exercises requires a laptop or tablet. Yes, a tablet works too! All participants will have access to a 2i2c Jupyter Lab instance running in AWS us-west 2.
+Participation in the exercises requires a laptop or tablet. Yes, a tablet works too! All participants will have access to a 2i2c Jupyter Lab instance running in AWS us-west 2.