docs: remove broken links from showcase

Jacky Zhao

2023-01-31 712dab5c8cd8933d9cdb63d4c833940c461a09da

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{{if $.Site.Data.config.enableGitHubEdit}}
<a href="{{$.Site.Data.config.GitHubLink}}/{{.File.Path}}" rel="noopener">{{ i18n "edit_source" }}</a>
{{end}}