chore: fix hugo deprecation warnings (hugo 0.157.0) (#586)

Andreas Deininger

5 days ago d23a5e8fbb7aeacd6fd2a39bf4616e63ede75121

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<!-- loading -->
<div class="sk-wrapper">
  <div class="sk-fold">
    <div class="sk-fold-cube"></div>
    <div class="sk-fold-cube"></div>
    <div class="sk-fold-cube"></div>
    <div class="sk-fold-cube"></div>
  </div>
</div>