message: docs(theming): update dark mode codepens
diff: @@ -78,8 +78,10 @@ function toggleDarkTheme(shouldAdd) {
  }
  ```
  +> Tip: make sure to view the Codepen below in a [supported browser]((https://caniuse.com/#feat=prefers-color-scheme)) and then try changing the system preferences on your device between light & dark mode. Here's [how to enable dark mode on Windows 10](https://blogs.windows.com/windowsexperience/2016/08/08/windows-10-tip-personalize-your-pc-by-enabling-the-dark-theme/) and [how to enable it on a Mac](https://support.apple.com/en-us/HT208976).
  +
  <!-- Codepen https://codepen.io/ionic/pen/jONzJpG -->
  -<code-pen user="ionic" slug="jONzJpG"></code-pen>
  +<docs-codepen preview="false" user="ionic" slug="jONzJpG" height="550px" default-tab="js,result"></docs-codepen>
  In addition to calling `toggleDarkTheme()` from `loadApp()` and when the media query changes, the `toggleDarkTheme()` function could be called by the app, such as when a user changes a toggle, to switch between the light and dark themes:
  @@ -109,7 +111,7 @@ function checkToggle(shouldCheck) {
  ```
  <!-- Codepen https://codepen.io/ionic/pen/zYOpQLj -->
  -<code-pen user="ionic" slug="zYOpQLj"></code-pen>
  +<docs-codepen preview="false" user="ionic" slug="zYOpQLj" height="600px" default-tab="js,result"></docs-codepen>
  ## Ionic Dark Theme
  