feat: caching, optimization, legal pages & footer

- WP Super Cache enabled (PHP mode, gzip, Nginx compatible)
- Autoptimize: CSS/HTML minification + deferred JS + Google Fonts optimization
- Cookie Notice: GDPR/LOPD banner styled with brand colors (navy/burgundy/gold)
- Legal pages: Aviso Legal, Política de Privacidad, Política de Cookies (ES)
- MU-plugin: custom footer with legal links + Cloud Host credit
- Footer: copyright, legal nav, Hosted & Maintained by Cloud Host (cloudhost.es)
- Security: X-Frame-Options, X-Content-Type, Referrer-Policy headers
- Security: XML-RPC disabled, REST user enumeration blocked
- Performance: emoji scripts removed, post revisions limited to 3

wp-content/plugins/autoptimize/classes/critcss-inc/js/admin_settings.js

@@ -0,0 +1,11 @@
+// Toggle button control for collapsible elements
+jQuery(".toggle-btn").click(function () {
+  $header = jQuery(this);
+  $content = $header.next();
+  $content.slideToggle(250, "swing", function () {
+      jQuery("span.toggle-indicator", $header).toggleClass('dashicons-arrow-down');
+  });
+});
+
+// Attach an event to export buttons
+jQuery("#exportSettings").click(function(){exportSettings();});