Update to ACT Rules redesign page

Hello,

Following the group's feedback in the survey and our recent discussion of the redesigned template for ACT Rules pages, I have made some tweaks <https://github.com/w3c/wai-wcag-supporting-documents-redesign/pull/31> to the template design: 
Move Accessibility Requirements Mapping to be in between Description and applicability
Add expand/collapse to each individual SC in the requirements mapping
Add expand all / colllapse all buttons to test cases
Add colon after Test Rule in header
For fragment links, remove aria-hidden and make visible on focus
Replace tooltip with link to explanation in spec
Use Conformance Rule in header instead of atomic
Order rules alphabetically (on the “All ACT Rules” page), this is for now, until we improve in some next iteration (after this project)
The updated page: https://w3c.github.io/wai-wcag-supporting-documents-redesign/2020-07-15-prototype-act.html <https://w3c.github.io/wai-wcag-supporting-documents-redesign/2020-07-15-prototype-act.html>

There is one thing I did not address: syntax highlighting. I am implementing this for Techniques / Understanding this week, and will look at whether or not to reuse what we do there for ACT Rules. So, syntax highlighting is still on the list.

Looking forward to hearing thoughts or any further feedback you may have! 

Best,
Hidde




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Web Accessibility Specialist ・ https://w3.org/people/hidde <https://w3.org/people/hidde> ・ Web Accessibility Initiative (WAI) at World Wide Web Consortium (W3C)