feat: improved accessibility for Show/Hide Accordions

[vladislavkeblysh]

Improving accessibility by marking up accordion labels as headings that fit the logical structure of the page. The

containing the show/hide sections will be assigned the role of presentation.

[openedx-webhooks]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.30%. Comparing base (af432ea) to head (801def1).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1635      +/-   ##
==========================================
+ Coverage   90.18%   90.30%   +0.11%     
==========================================
  Files         339      338       -1     
  Lines        5810     5692     -118     
  Branches     1409     1342      -67     
==========================================
- Hits         5240     5140     -100     
+ Misses        552      535      -17     
+ Partials       18       17       -1     

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[itsjeyd]

@vladislavkeblysh Thank you for this contribution! Since it seems to include user-facing changes, you'll likely need to get product approval for it. When you're ready please follow the instructions from the bot to get that process started.

[itsjeyd]

Hey @vladislavkeblysh, just checking in to see if you're still planning to continue working on this PR?

[vladislavkeblysh]

@itsjeyd Ready to review

[PKulkoRaccoonGang]

[inform]: Awaiting Product Review

[itsjeyd]

@vladislavkeblysh As @PKulkoRaccoonGang pointed out above, this PR will need to go through product review as a next step.