docs: remove broken links from showcase

Jacky Zhao

2023-01-31 712dab5c8cd8933d9cdb63d4c833940c461a09da

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{{if $.Site.Data.config.enableMermaid}}
  {{ if .Page.Store.Get "hasMermaid" }}
    <script type="module">
      import mermaid from 'https://unpkg.com/mermaid@9/dist/mermaid.esm.min.mjs';
      mermaid.initialize({ startOnLoad: true });
    </script>
  {{ end }}
{{ end }}