add_block(new Block("Upload", $this->build_upload_block(), "head", 20));
        $page->add_block(new Block("Upload", $this->build_upload_block(), "left", 20));
    }
    public function display_full(Page $page): void
    {
        $page->add_block(new Block("Upload", "Disk nearly full, uploads disabled", "head", 20));
    }
    public function display_page(Page $page): void
    {
        parent::display_page($page);
        $html = "
			Tagging Guide
		";
        $page->add_block(new Block(null, $html, "main", 19));
    }
    protected function build_upload_block(): HTMLElement
    {
        return A(["href"=>make_link("upload"), "style"=>'font-size: 2em; display: block;'], "Upload");
    }
}