Add custom heading style
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		@@ -8,3 +8,4 @@ bookdown::gitbook:
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      link: https://github.com/hadley/r4ds/edit/master/%s
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					      link: https://github.com/hadley/r4ds/edit/master/%s
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      text: "Edit"
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					      text: "Edit"
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    sharing: no
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					    sharing: no
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					  css: r4ds.css
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