Extract contact form JavaScript to separate file and remove shortcode from contact pages
- Move contact form Alpine.js logic to assets/js/contact-form.js
- Simplify contact-form.html shortcode by removing inline script
- Load contact-form.js in baseof.html after Alpine.js
- Temporarily remove {{< contact_form >}} shortcode from contact pages
(shortcode parsing issue to investigate later)
- Contact pages now display with placeholder text
