The form submission handling in the index page has been updated to prevent page refresh and display success or error messages instead. Accordingly, the HomeController's requestNewsletter method no longer redirects to the home page upon submission, but instead returns an HTTP status and message.

This commit allows the reCaptcha functionality to be enabled or disabled through a property in application.properties. When disabled, form submission and validation proceed without reCaptcha verification. This change affects the HomeController and the display condition of the reCaptcha div in index.html.