feat: add customizer option to disable post type

Introduced a new customizer setting to disable posts. This includes:
- New customizer settings and controls for enabling or disabling posts.
- Functions to unregister the post type and remove it from the admin menu when disabled.
- Post exclusion from front-end queries when disabled.

Provides flexibility for sites that may not need the post functionality.

functions.php

@@ -1033,3 +1033,53 @@ function preprocess_mathjax_content($content)
 }
 
 add_filter('the_content', 'preprocess_mathjax_content');
+
+function customize_register($wp_customize) {
+    // Add setting to disable posts
+    $wp_customize->add_setting('disable_posts', array(
+        'default'   => false,
+        'transport' => 'refresh',
+    ));
+
+    // Add control for the setting
+    $wp_customize->add_control('disable_posts_control', array(
+        'label'     => __('Disable Posts', 'duck_behavior_journal'),
+        'section'   => 'title_tagline',
+        'settings'  => 'disable_posts',
+        'type'      => 'checkbox',
+    ));
+}
+
+add_action('customize_register', 'customize_register');
+
+function unregister_post_type() {
+    // Get the customizer setting
+    $disable_posts = get_theme_mod('disable_posts', false);
+
+    // If the setting is enabled, unregister the post type
+    if ($disable_posts) {
+        unregister_post_type('post');
+    }
+}
+
+add_action('init', 'unregister_post_type', 20);
+
+function remove_post_menu_item() {
+    $disable_posts = get_theme_mod('disable_posts', false);
+    if ($disable_posts) {
+        remove_menu_page('edit.php');
+    }
+}
+
+add_action('admin_menu', 'remove_post_menu_item');
+
+function exclude_posts_from_queries($query) {
+    if (!is_admin() && $query->is_main_query()) {
+        $disable_posts = get_theme_mod('disable_posts', false);
+        if ($disable_posts) {
+            $query->set('post_type', array('page'));
+        }
+    }
+}
+
+add_action('pre_get_posts', 'exclude_posts_from_queries');