Document how layout extension works

exampleSite/content/home/usage.md

@@ -107,64 +107,3 @@ weight = 10
 
 <small>💡 Tip: Use `weight` to specify the order that files should be added.</small>
 
----
-
-# Configuration
-
----
-
-## Reveal.js themes
-
-Put in `config.toml` or a presentation's front matter.
-
-Use the `theme` key for themes that come with Reveal.js.
-
-```toml
-[params.reveal_hugo]
-theme = "moon"
-highlight_theme = "zenburn"
-```
-
-[Reveal.js themes](https://github.com/hakimel/reveal.js/#theming) &middot;
-[highlight.js themes](https://highlightjs.org/static/demo/)
-
----
-
-## Use a custom theme
-
-Use the `custom_theme` key to point to a CSS file in the `static` directory.
-
-```toml
-[params.reveal_hugo]
-custom_theme = "reveal-hugo/themes/robot-lung.css"
-```
-
----
-
-## Like this theme?
-
-reveal-hugo comes with 2 extra Reveal.js themes:
-
-- [robot-lung](https://github.com/dzello/revealjs-themes#robot-lung) (this one)
-- [sunblind](https://github.com/dzello/revealjs-themes#sunblind)
-
-<br>
-<small>
-They live in the `static/reveal-hugo/themes` folder and also [on Github](https://github.com/dzello/revealjs-themes).
-</small>
-
----
-
-## Reveal.js params
-
-Set **snakecase** versions of Reveal.js params, which will be camelized and passed to `Reveal.initialize`.
-
-```toml
-[params.reveal_hugo]
-history = true
-slide_number = true
-transition = 'zoom'
-transition_speed = 'fast'
-```
-
-[Full list of params](https://github.com/hakimel/reveal.js/#configuration)