feat: Add Contact form

[ivanrdgz03]

I have added the contact form that was previously removed. I also added:

• Support for notifying messages sent via a Telegram bot.
• Use of a new library Zod for form sanitization.
• Use of Google Recaptcha to prevent use by bots.
• Rate limiting by IP, temporarily stored in a Map, although ideally this will be improved in the future with REDIS or similar.

The following environment variables are required:

• TELEGRAM_BOT_TOKEN: Telegram bot token.
• TELEGRAM_CHAT_ID: Chat to which the bot sends messages.
• PUBLIC_RECAPTCHA_SITE_KEY: Recaptcha public key.
• RECAPTCHA_SECRET_KEY: Recaptcha secret key.