Sweep: add an emoji to our "Join our community" button in the call to action using fontawesome

[sweep-nightly[bot]]

Description

This pull request introduces a visual enhancement to the "Join our community" button in the Call to Action component. By leveraging FontAwesome icons, we've added a Discord emoji next to the button text, improving the visual appeal and making the purpose of the button more immediately recognizable.

Summary

• Added the faDiscord icon from @fortawesome/free-brands-svg-icons to CallToAction.tsx for a more visually appealing "Join our community" button.
• Modified ExternalLinkWithText.tsx to accept an emoji prop of type IconDefinition. This allows for the dynamic rendering of FontAwesome icons alongside the link text.
• Ensured that the new emoji prop is properly displayed by integrating the FontAwesomeIcon component within ExternalLinkWithText.tsx.
• Adjusted styling slightly to accommodate the inclusion of the icon without disrupting the existing layout and design.

Affected Files:

• src/components/CallToAction.tsx
• src/components/ExternalLinkWithText.tsx

Fixes #615.

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Rollback Files For Sweep

• [ ] Rollback changes to src/components/ExternalLinkWithText.tsx
• [ ] Rollback changes to src/components/CallToAction.tsx

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Apply Sweep Rules to your PR?

• [ ] Apply: Any user facing text should be high quality.
• [ ] Apply: We should have corresponding tests for all new and existing code. We use jest for tests.
• [ ] Apply: There should not be large chunks of commented out code besides docstrings.

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