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 within the CallToAction component. By integrating a FontAwesome icon, we aim to make the call to action more engaging and visually appealing to users.

Summary

• Added FontAwesomeIcon and faUsers imports from @fortawesome/react-fontawesome to CallToAction.tsx.
• Integrated the faUsers icon into the "Join our community" button to add visual appeal and emphasize the community aspect.
• This change affects the CallToAction.tsx file, enhancing the user interface by making the community invitation more inviting and noticeable.

Fixes #615.

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Rollback Files For Sweep

• [ ] 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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