theme_setup()

        public function theme_setup(){
            //Additions
            add_theme_support('post-thumbnails');
            add_theme_support('custom-logo'); //Custom logo support.
            add_theme_support('title-tag'); //Title tag support allows WordPress core to create the <title> tag.
            //add_theme_support('html5', array('comment-list', 'comment-form', 'search-form', 'gallery', 'caption'));
            add_theme_support('automatic-feed-links'); //Add default posts and comments RSS feed links to head

            add_theme_support('responsive-embeds');
            add_theme_support('wp-block-styles');
            add_theme_support('align-wide'); //Wide image alignment

            //Custom color palette to Gutenberg editor
            add_theme_support('editor-color-palette', array(
                array(
                    'name' => 'Primary',
                    'slug' => 'primary',
                    'color' => get_theme_mod('nebula_primary_color', $this->get_color('$primary_color')),
                ),
                array(
                    'name' => 'Secondary',
                    'slug' => 'secondary',
                    'color' => get_theme_mod('nebula_secondary_color', $this->get_color('$secondary_color')),
                )
            ));

            add_post_type_support('page', 'excerpt'); //Allow pages to have excerpts too

            //Removals
            remove_theme_support('custom-background');
            remove_theme_support('custom-header');

            //Remove capital P core function
            remove_filter('the_title', 'capital_P_dangit', 11);
            remove_filter('the_content', 'capital_P_dangit', 11);
            remove_filter('comment_text', 'capital_P_dangit', 31);

            //Head information
            remove_action('wp_head', 'rsd_link'); //Remove the link to the Really Simple Discovery service endpoint and EditURI link (third-party editing APIs)
            remove_action('wp_head', 'wp_generator'); //Removes the WordPress XHTML Generator meta tag and WP version
            remove_action('wp_head', 'wp_shortlink_wp_head'); //Removes the shortlink tag in the head
            remove_action('wp_head', 'feed_links', 2); //Remove the links to the general feeds: Post and Comment Feed
            remove_action('wp_head', 'wlwmanifest_link'); //Remove the link to the Windows Live Writer manifest file
            remove_action('wp_head', 'feed_links_extra', 3); //Remove the links to the extra feeds such as category feeds
            remove_action('wp_head', 'index_rel_link'); //Remove index link (deprecated?)
            remove_action('wp_head', 'start_post_rel_link', 10, 0); //Remove start link
            remove_action('wp_head', 'parent_post_rel_link', 10, 0); //Remove previous link
            remove_action('wp_head', 'adjacent_posts_rel_link', 10, 0); //Remove relational links for the posts adjacent to the current post

            //Add new image sizes (Given human-readible names in another function below)
            //"max_size" custom image size is defined in /libs/Optimization.php
            add_image_size('square', 512, 512, 1);
            add_image_size('open_graph_large', 1200, 630, 1);
            add_image_size('open_graph_small', 600, 315, 1);
            add_image_size('twitter_large', 280, 150, 1);
            add_image_size('twitter_small', 200, 200, 1);
        }