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/autoptimize_404_handler.php

@@ -0,0 +1,52 @@
+<?php
+/**
+ * Autoptimize's magic 404 handler.
+ *
+ * Configure your webserver to have requests for files that are no longer in
+ * /wp-content/cache/autoptimize/ to redirect to this file. AO's .htaccess file
+ * will have a "Errordocument:" directive to automatically do this.
+ *
+ * This file has simple logic to redirect to the "fallback" files that are
+ * created automatically by AO to avoid visitors seeing broken pages or
+ * Googlebot getting utterly confused.
+ *
+ * Error logging is off by default (don't want to flood your php errorlog, but
+ * can be enabled by this code snippet:
+ *
+ * add_filter( 'autoptimize_filter_cache_fallback_log_errors', '__return_true' );
+ *
+ * Warning: the fallback files might not apply to all pages, so this is a just
+ * a temporary solution, you really should clear any page cache to avoid requests
+ * to files that don't exist in AO's cache.
+ */
+
+$original_request = strtok( $_SERVER['REQUEST_URI'], '?' );
+
+if ( strpos( $original_request, 'uucss/uucss-' ) !== false ) {
+    $original_request = preg_replace( '/uucss\/uucss-[a-z0-9]{32}-/', 'css/', $original_request  );
+}
+
+$fallback_target  = preg_replace( '/(.*)_(?:[a-z0-9]{32})\.(js|css)$/', '${1}_fallback.${2}', $original_request );
+$ao_cache_dir     = '/www/wwwroot/acrib.es/wp-content/cache/autoptimize/';
+$js_or_css        = pathinfo( $original_request, PATHINFO_EXTENSION );
+
+// add multisite logic.
+$multisite = false;
+if ( true === $multisite ) {
+    preg_match( '#\/([0-9]{1,5})\/(?:js|css)\/[a-z0-9]*_fallback\.(?:js|css)$#', $fallback_target, $child_site_id );
+    $ao_root_cache_dir = preg_replace( '#[0-9]*\/$#', '', $ao_cache_dir );
+    $ao_cache_dir      = $ao_root_cache_dir . $child_site_id[1] . '/';
+}
+
+$fallback_path = $ao_cache_dir . $js_or_css . '/autoptimize_fallback.' . $js_or_css;
+
+if ( $original_request !== $fallback_target && file_exists( $fallback_path ) ) {
+    // error_log( 'Autoptimize file ' . $original_request . ' not found, using fallback instead.' );
+    header( 'HTTP/1.1 302 Found' );
+    header( 'Location: ' . $fallback_target );
+} else {
+    // error_log( 'Autoptimize file ' . $original_request . ' not found, sending 410 gone response.' );
+    header( 'HTTP/1.1 410 Gone' );
+}
+
+exit();