Sweep: stack the two call to action buttons horizontally instead of vertically

[sweep-nightly[bot]]

Description

This pull request updates the layout of the call to action buttons in the CallToAction component, changing their arrangement from vertical to horizontal. This aims to improve the user interface by making the buttons more accessible and visually appealing.

Summary

• Wrapped the "Get started - free" and "Book a demo" buttons in a <Stack> component to align them horizontally.
• Adjusted the margin-right property of the "Get started - free" button to ensure proper spacing in the new layout.
• Maintained the original color scheme, padding, hover effect, and onClick functionality for both buttons.
• Affected file: src/components/CallToAction.tsx.

Fixes #647.

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Rollback Files For Sweep

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

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