feat: make starter html layout optional

[vltansky]

    <section class="swiper-container">
      <div class="swiper-slide">Slide 1</div>
      <div class="swiper-slide">Slide 2</div>
      <div class="swiper-slide">Slide 3</div>
      <div class="swiper-slide">Slide 4</div>
      <div class="swiper-slide">Slide 5</div>
      <div class="swiper-slide">Slide 6</div>
      <div class="swiper-slide">Slide 7</div>
      <div class="swiper-slide">Slide 8</div>
      <div class="swiper-slide">Slide 9</div>
      <div class="swiper-slide">Slide 10</div>
    </section>

The downside is probably CLS. But we can recommend to use full structure for better performance?

Not sure if it should target v7 branch or just master?

[dawidmalec7]

If someone uses TypeScript and used navigation methods in that way: swiper.navigation.update();. TypeScript will raise a error: "Property 'update' does not exist on type boolean | NavigationMethods"