Method toggleTheme

src/dev-app/dev-app/dev-app-layout.ts:161–165

(value = !this.state.darkTheme)

  }

  toggleTheme(value = !this.state.darkTheme) {
    this.state.darkTheme = value;
    this._document.body.classList.toggle('demo-unicorn-dark-theme', value);
    setAppState(this.state);
  }

  toggleSystemTheme(value = !this.state.systemTheme) {
    this.state.systemTheme = value;