[feat]: Use Server action on Contact Form

[heyitsOK]

Description

We should replace the /api/send route with a server action that the ContactForm component can use. Server actions would help us reduce the logic required to manage the ContactForm and get rid of the unnecessary API route as well.

Suggested Solution

Next.js documentation on server actions:
https://nextjs.org/docs/app/building-your-application/data-fetching/server-actions-and-mutations#forms