Made changes to improve code & style of "try our assistant" in dashboard #2695

[Amarjit0511]

Made the following changes for the issue: #2695

• Used Box instead of Flex as it is simpler and more appropriate here.
• Added mb={6} to add some margin at the bottom of the box.
• Used Heading with as="h2" instead of size="lg".
• Added fontWeight="bold" and fontSize="xl" to make the button more prominent.
• Changed the button text to "Start Chatting" as it is more action-oriented.
• Added _hover to change the background color of the button on hover.
• Used passHref in the Link component to pass the href to the child component.
• Changed the Button component to an anchor a tag with as="a" to make it more accessible.

[github-actions]

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