Update the build forms recipe to use actions instead.

[Abdo-reda]

📚 Subject area/topic

HTML forms, and Actions

📋 Page(s) affected (or suggested, for new content)

https://docs.astro.build/en/recipes/build-forms/

📋 Description of content that is out-of-date or incorrect

This recipe uses standard handling of html. A section should be included to use actions instead because that's the updated way and a more cleaner way of handling forms in astro.

🖥️ Reproduction in StackBlitz (if reporting incorrect content or code samples)

No response