Add layout and example for leaf bundles; addresses #27

exampleSite/content/bundle-example/continued.md

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+
+If more markdown files are present in the bundle, their contents will be added to the presentation.
+
+---
+
+Specify `weight` in the frontmatter if it's necessary to order them.
+
+---
+
+If you don't want them to be included, specify `layout = "list"` in the front matter instead of `layout = "bundle"`.
+
+---
+
+## THE END

exampleSite/content/bundle-example/index.md

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+title = "Bundle example presentation"
+outputs = ["Reveal"]
+layout = "bundle"
+[reveal_hugo]
+theme = "night"
+margin = 0.2
++++
+
+# Page Bundles
+
+---
+
+[Hugo page bundles](https://gohugo.io/content-management/page-bundles/) are a useful way to organize content.
+
+---
+
+To create a reveal-hugo presentation from the `index.md` file of a leaf page bundle, you need to specify the layout manually.
+
+```toml
+layout = "bundle"
+```
+
+---
+
+Why? By default, reveal-hugo doesn't create pages for single template types (foo.md), only for list template types (_index.md).
+
+---
+
+This technique can also be used to output an HTML file for any section of a presentation, should you need to.

layouts/_default/bundle.reveal.html

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+{{ define "main" }}
+  {{ partial "reveal-hugo/slides" (slice .Page) }}
+  {{ partial "reveal-hugo/slides" (.Resources.ByType "page") }}
+{{ end }}