docs: add htmlexample shortcode

[zeroedin]

What I did

1. Added {% htmlexample %} short code to display HTML example code in a disclosure.

Testing Instructions

1. View Deploy preview and look at the usage of the shortcodes for hiding and displaying the HTML examples.

Notes to Reviewers

I think we might need to apply some style to the <details> generated by the shortcode. Ideas welcome!

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[github-actions]

✅ Deploy Preview for patternfly-elements ready!

Name	Link
🔨 Latest commit	6022f0e
😎 Deploy Preview	https://deploy-preview-2412--patternfly-elements.netlify.app/

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[brianferry]

I think we might need to apply some style to the

Details

generated by the shortcode. Ideas welcome!

Might be worth making a pfe disclosure element as well as an rh-disclosure element down the line both using the <details> element.

[zeroedin]

@brianferry the fact that when you quoted this bit of text it actually turned into a details element is priceless.

[brianferry]

Lemurs Galloping Towards Munchies