Update install-a-demo.md
Fix broken link to docker demo
# Docker Demo
-This demo, available to download [here](https://drive.google.com/file/d/1YS9itn7Hgvc74YTD7iFKDgmRg8gaCY1_/view?usp=sharing), is loaded with sample content and configurations to demonstrate
+This demo, available to download [here](https://www.dropbox.com/s/px0gxg3ik4hhypc/Islandora-Sandbox-Docker-Demo-2022.zip?dl=0), is loaded with sample content and configurations to demonstrate
features of Islandora and provide a starting point for exploration.
-Download [this file](https://drive.google.com/file/d/1YS9itn7Hgvc74YTD7iFKDgmRg8gaCY1_/view?usp=sharing), and open and follow the instructions in the README.md.html file (also shown below). It is recommended that you have a minimum of 4GB of space available on your machine before getting started. Thanks, and happy building!
+Download [this file](https://www.dropbox.com/s/px0gxg3ik4hhypc/Islandora-Sandbox-Docker-Demo-2022.zip?dl=0), and open and follow the instructions in the README.md.html file (also shown below). It is recommended that you have a minimum of 4GB of space available on your machine before getting started. Thanks, and happy building!
Requirements
