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/autoptimizeCSSmin.php

@@ -0,0 +1,69 @@
+<?php
+/**
+ * Thin wrapper around css minifiers to avoid rewriting a bunch of existing code.
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+    exit;
+}
+
+class autoptimizeCSSmin
+{
+    /**
+     * Minifier instance.
+     *
+     * @var Autoptimize\tubalmartin\CssMin\Minifier|null
+     */
+    protected $minifier = null;
+
+    /**
+     * Construtor.
+     *
+     * @param bool $raise_limits Whether to raise memory limits or not. Default true.
+     */
+    public function __construct( $raise_limits = true )
+    {
+        $this->minifier = new Autoptimize\tubalmartin\CssMin\Minifier( $raise_limits );
+    }
+
+    /**
+     * Runs the minifier on given string of $css.
+     * Returns the minified css.
+     *
+     * @param string $css CSS to minify.
+     *
+     * @return string
+     */
+    public function run( $css )
+    {
+        // hide calc() if filter says yes (as YUI CSS compressor PHP port has problems retaining spaces around + and - operators).
+        // regex see tests at https://regex101.com/r/ofGQG9/1
+        if ( apply_filters( 'autoptimize_filter_css_hide_calc', true ) ) {
+            $css = autoptimizeBase::replace_contents_with_marker_if_exists( 'CALC', 'calc(', '#(calc|min|max|clamp)\([^;}]*\)#m', $css );
+        }
+
+        // minify.
+        $result = $this->minifier->run( $css );
+
+        // restore calc() if filter says yes.
+        if ( apply_filters( 'autoptimize_filter_css_hide_calc', true ) ) {
+            $result = autoptimizeBase::restore_marked_content( 'CALC', $result );
+        }
+
+        return $result;
+    }
+
+    /**
+     * Static helper.
+     *
+     * @param string $css CSS to minify.
+     *
+     * @return string
+     */
+    public static function minify( $css )
+    {
+        $minifier = new self();
+
+        return $minifier->run( $css );
+    }
+}