feat: hide TOC when no headers (closes #204)

Jacky Zhao

2022-09-23 cd7e2088d564023b073a458282e3a63b7a108c0b

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