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

[sweep-nightly]

Description

This pull request introduces a visual enhancement to the "Join our community" button in the Call to Action component by adding a Discord emoji using FontAwesome. This change aims to make the button more appealing and visually indicative of the community platform.

Summary

• Added the faDiscord icon from @fortawesome/free-brands-svg-icons to CallToAction.tsx to represent the community platform visually.
• Modified ExternalLinkWithText.tsx to accept an emoji prop of type IconDefinition. This allows the display of a FontAwesome icon alongside the link text.
• Ensured that the Discord icon is displayed before the "Join our community" text in the Call to Action component, enhancing visual appeal and immediate recognition of the platform.
• Adjusted styles and props in CallToAction.tsx and ExternalLinkWithText.tsx to incorporate the new icon seamlessly.

Files modified:

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

Fixes #615.

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[sweep-nightly]

Rollback Files For Sweep

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

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[sweep-nightly]

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• Apply: Any user facing text should be high quality.
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