docs: update login pg pic

Signed-off-by: Samantha Coyle <[email protected]>

Author: sicoyle

annotationSteps.md

@@ -20,7 +20,7 @@ Jobs allow you to split up tasks by frame to divvy up the annotations among a te
 ## Steps to follow to create an annotation project
 1. Create an account and login at [cvat.org](https://app.cvat.ai/auth/login).
 
-![CVAT Login Page](./assets/screenshots/cvatLoginPage.jpg)
+![CVAT Login Page](./assets/screenshots/cvatLoginPage.png)
 > While creating a new account, a valid email address is required. Tool requires email confirmation by clicking on the link sent to this email address