Fix initials on testimonials page

[sweep-ai]

Description

This PR fixes the issue with the initials on the testimonials page. Previously, all testimonials displayed the initials "JE" regardless of the user's name. With this fix, the initials are dynamically generated based on the user's name.

Summary of Changes

• Modified the User component to accept a 'name' prop and generate initials from it.
• Updated the Testimonial component to pass the 'name' prop to the User component.

Please review and merge this PR. Thank you!

Fixes #67.

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