Sweep: add an emoji to our "Contact us" button in the call to action using fontawesome

[sweep-nightly]

Description

This pull request introduces a visual enhancement to the "Contact us" button within the Call to Action component by incorporating a calendar emoji using FontAwesome. This change aims to make the call to action more engaging and visually appealing, encouraging users to book a call with us.

Summary

• Added FontAwesomeIcon and faCalendarAlt imports from @fortawesome/react-fontawesome to CallToAction.tsx.
• Updated the "Contact us" button text to "Book a call" and added a calendar icon in front of the text to make the action more descriptive and visually appealing.
• These changes were made in the src/components/CallToAction.tsx file, enhancing the user interface by making the call to action more noticeable and attractive.

Fixes #615.

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[sweep-nightly]

Rollback Files For Sweep

• Rollback changes to src/components/CallToAction.tsx

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[sweep-nightly]

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• 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.
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