docs: update homepage

{{ define "sidebar-prefooter" }}

<section class="section section-sm">

  <div class="container">

    <div class="row justify-content-center text-center">

      <div class="col-lg-5">

        <h2 class="h4">Security aware</h2>

        <p>Get A+ scores on <a href="https://observatory.mozilla.org/analyze/doks.netlify.app">Mozilla Observatory</a> out of the box. Easily change the default Security Headers to suit your needs.</p>

      </div>

      <div class="col-lg-5">

        <h2 class="h4">Fast by default</h2>

        <p>Get 100 scores on <a href="https://googlechrome.github.io/lighthouse/viewer/?gist=7731347bb8ce999eff7428a8e763b637">Google Lighthouse</a> by default. Doks removes unused css, prefetches links, and lazy loads images.</p>

      </div>

      <div class="col-lg-5">

        <h2 class="h4">SEO-ready</h2>

        <p>Use sensible defaults for structured data, open graph, and Twitter cards. Or easily change the SEO settings to your liking.</p>

      </div>

    </div>

    <div class="row justify-content-center text-center">

      <div class="col-lg-5">

        <h2 class="h4">Full text search</h2>