onRender() {
      const { name } = this.config;
      const currentPath = this.router.toURL(this.router.getCurrentPath());
      const currentSection = dom
        .find(`.sidebar a[href='${currentPath}']`)
        ?.getAttribute('title');

      const currentTitle = name
        ? currentSection
          ? `${currentSection} - ${name}`
          : name
        : currentSection;

      // Update page title
      dom.$.title = currentTitle || this.#title;

      this.#markAppNavActiveElm();
      this.#markSidebarCurrentPage();
      this.#initHeadings();
    }
Handle rendering UI element updates and new content
@void