Add shortcodes for customizing slides, markdown, HTML

exampleSite/content/home/shortcodes/other.md

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+## Note shortcode
+
+Add speaker notes to your presentation.
+
+```markdown
+{{%/* note */%}}
+Type 's' to see this slide's speaker notes.
+{{%/* /note */%}}
+```
+
+{{% note %}}
+You found the speaker notes!
+{{% /note %}}
+
+---
+
+<section data-noprocess>
+  <h2>Pure HTML Slide</h2>
+  <p>Surround slides in a <code>section</code> tag with a <code>data-noprocess</code> attribute to write them in HTML.</p>
+</section>