Sweep: Change the install app button color to green

[sweep-ai]

This pull request updates the color scheme of the "Install App" button in the CallToAction component from purple to green, enhancing the visual appeal and aligning with the new branding guidelines.

- Changed the `colorScheme`, `bg`, and `_hover` properties from `purple` to `green` in the `CallToAction.tsx` file. - This modification affects the button appearance, making it more vibrant and noticeable to users.

Fixes #366.

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Rollback Files For Sweep

• Rollback changes to src/components/CallToAction.tsx

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Sweep: PR Review

src/components/CallToAction.tsx

The button color scheme in the CallToAction component was changed from purple to green.

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