Document ability to change CDN urls

README.md

@@ -288,17 +288,15 @@ You can use all the additional slide shortcode attributes. They will be applied
 
 ## Configuration
 
-Customize the Reveal.js presentation by setting these values in `config.toml` or the front matter of any presentation's `index.md` file.
+Customize the Reveal.js presentation by setting these values in `config.toml` or the front matter of any presentation's `_index.md` file.
 
 - `params.reveal_hugo.theme`: The Reveal.js theme used, defaults to "black"
 - `params.reveal_hugo.custom_theme`: The path to a locally hosted Reveal.js theme
 - `params.reveal_hugo.highlight_theme`: The [highlight.js](https://highlightjs.org/) theme used, defaults to "default"
+- `params.reveal_hugo.reveal_cdn`: The location to load Reveal.js files from, defaults to `https://cdnjs.cloudflare.com/ajax/libs/reveal.js/3.6.0`
+- `params.reveal_hugo.highlight_cdn`: The location to load highlight.js files from, defaults to `https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0`
 
-Include any other attributes in `params.reveal_hugo` that you'd like to be fed as arguments to `Reveal.initialize` in **snakecase**. So `slideNumber` becomes `slide_number`. The reason is that Hugo lowercases all params and Reveal.js is case-sensitive. Params are converted from snakecase to camelcase before passing to Reveal.js.
-
-See the [extensive list of Reveal.js configuration options](https://github.com/hakimel/reveal.js/#configuration) here. The defaults used by this theme are located in `data/reveal_hugo.toml`.
-
-If you're new to TOML, this is how it should look in your `config.toml`:
+This is how parameters will look in your `config.toml`:
 
 ```TOML
 [params.reveal_hugo]
@@ -312,6 +310,10 @@ Or in the front matter of an `_index.md` file:
 theme = "moon"
 ```
 
+Include any other attributes in those sections that you'd like to be fed as arguments to `Reveal.initialize` in **snakecase**, so `slide_number` instead of `slideNumber`. Params are converted from snakecase to camelcase before passing to Reveal.js. This is necessary to maintain the proper case of the parameters.
+
+See the [extensive list of Reveal.js configuration options](https://github.com/hakimel/reveal.js/#configuration) here. Several defaults used by this theme are located in `data/reveal_hugo.toml`.
+
 ## Adding HTML to the layout
 
 If you need to add something to the HTML page, just override one or both of the empty partials that live at `layouts/partials/reveal-hugo/body.html` and `layouts/partials/reveal-hugo/head.html`. These partials are injected into the page just before the closing of the body and head tags respectively. Common uses would be to add custom CSS or JavaScript to your presentation.
@@ -344,6 +346,8 @@ Now you can add `outputs = ["Reveal"]` to the front matter of any section's `_in
 
 Note: If you specify `outputs = ["Reveal"]` for a single content file, you can prevent anything being generated for that file. This is handy if you other default layouts that would have created a regular HTML file from it. Only the list file is required for the presentation.
 
+**Tip**: As of Hugo 0.42, Hugo [has theme inheritence](https://gohugo.io/news/0.42-relnotes/). You can avoid the file copying step above by adding `"reveal-hugo"` to your site's array of themes.
+
 ## Reveal.js tips
 
 These are some useful Reveal.js features and shortcuts.