Introduction Video needs to be updated

[krishnakalyan3]

Our docs and the README file need to point to an updated video without dataroot parameter.

[krishnakalyan3]

Videos that can be reviewed and made sure that its up to date

• https://user-images.githubusercontent.com/23050213/153156641-6ffd9c0c-8a23-4ec6-8e83-dc3c6054e5c6.mp4
• https://user-images.githubusercontent.com/23050213/153156559-2ef0a745-4367-4df8-b64b-23e78869ae6c.mp4
• https://user-images.githubusercontent.com/23050213/153156339-0f803a2b-ce13-4ef1-abaa-a9a827843b14.mp4
• https://grid-docs.s3.us-east-2.amazonaws.com/run.mp4
• https://grid-docs.s3.us-east-2.amazonaws.com/session_3.mp4
• https://grid-docs.s3.us-east-2.amazonaws.com/datastore.mp4
• https://grid-docs.s3.us-east-2.amazonaws.com/intro_video_mp42.mp4
• https://grid-docs.s3.us-east-2.amazonaws.com/run_cifar5.mp4
• https://user-images.githubusercontent.com/47154698/146597173-30a6f5af-4ecc-4958-866a-95ddb1ba70e0.mp4