Add warning to guides and change styling of tip

[aliabd]

The ability to add a stylized warning to guides and modifies the styling of tip to be green (warning is red). Also replaces emojis with svgs so they look nicer.

This pr doesn't actually add a warning anywhere though, so maybe @abidlabs you can? just push to the pr if its easier.

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
	Storybook	ready!	Storybook preview
🦄	Changes	detected!	Details

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Install Gradio from this PR

pip install https://gradio-pypi-previews.s3.amazonaws.com/7287d5e890b68f6387f556afdf069b7bd2fec8f3/gradio-4.41.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@7287d5e890b68f6387f556afdf069b7bd2fec8f3#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/7287d5e890b68f6387f556afdf069b7bd2fec8f3/gradio-client-1.5.0.tgz

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
website	minor

• Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

Add warning to guides and change styling of tip

Maintainers or the PR author can modify the PR title to modify this entry.

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• Maintainers can change the version label to modify the version bump.
• If the bot has failed to detect any changes, or if this pull request needs to update multiple packages to different versions or requires a more comprehensive changelog entry, maintainers can update the changelog file directly.

[abidlabs]

LGTM @aliabd! I'll add warnings in #9074