Use home folder for default presentation

Add an example presentation for a section

exampleSite/content/home/body.md

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++++
+weight = 20
++++
+
+# reveal-hugo
+
+Presentation content lives in `content/reveal`.
+
+Or manually set the type.
+
+```toml
++++
+type = "reveal"
++++
+```
+
+---
+
+# reveal-hugo
+
+Presentation sections are ordered by `weight`.
+
+```toml
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+weight = 20
++++
+```
+
+---
+
+# reveal-hugo
+
+Protip: use `fragment` shortcode to make content appear in sequence.
+
+```
+{{%/* fragment */%}} One {{%/* /fragment */%}}
+{{%/* fragment */%}} Two {{%/* /fragment */%}}
+{{%/* fragment */%}} Three {{%/* /fragment */%}}
+```
+
+{{% fragment %}} One {{% /fragment %}}
+{{% fragment %}} Two {{% /fragment %}}
+{{% fragment %}} Three {{% /fragment %}}

exampleSite/content/home/conclusion.md

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+weight = 30
++++
+
+# reveal-hugo
+
+If you want your markdown files to contain more than one slide...
+
+🤔
+
+...this theme is for you!

exampleSite/content/home/introduction.md

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+weight = 10
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+
+# reveal-hugo
+
+One markdown file, multiple slides.
+
+Separate slides with `---`
+
+```markdown
+# Slide 1
+
+Body 1.
+
+---
+
+# Slide 2
+
+Body 2.
+
+```
+
+---
+
+# reveal-hugo
+
+Hello!
+
+I'm a new slide from the same markdown file.