update font awesome version (#304)

Clément Pannetier

13.44.2020 e46c452344a13d94b2748efa8a281778fc70df4b

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<section class="container centered">
  <div class="error">
    <h1>404</h1>
    <h2>{{ i18n "page_not_found" }}</h2>
    <p>{{ i18n "page_does_not_exist" }}<br />{{ i18n "head_back" .Site.BaseURL | safeHTML }}</p>
  </div>
</section>