Correct installation notes for Gem + Remote Theme support

Author: allejo

index.md

@@ -24,12 +24,18 @@ Add this line to your Jekyll site's Gemfile:
 gem "jekyll-docs-theme"
 ```
 
+And then enable and use the theme in your Jekyll site via its `_config.yml`.
+
+```yaml
+theme: jekyll-docs-theme
+```
+
 ### GitHub Pages
 
-And add this line to your Jekyll site's _config.yml:
+And add this line to your Jekyll site's `_config.yml`:
 
 ```yaml
-theme: jekyll-docs-theme
+remote_theme: allejo/jekyll-docs-theme
 ```
 
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