Creates a colored block with text and optional image
Parameters
text = Text content for the block
backgroundColor = Background color (e.g., "blueviolet")
textColor = Text color (e.g., "white")
imageURL = URL of image to display
imageRight = Position image on right side ("true" or "false")
[{ContrastBlock text="Some text in here" backgroundColor="blueviolet" textColor="white" imageURL="/OpenForum/Images/open-forum-dog.png" imageRight="false"}]