[Feature] Add support for accordions

## Problem
A non-exhaustive list of pages that would benefit from support for accordions:
- LegalDB FAQ
- https://legaldb.creativecommons.org/faq/
- (currently features accordion from legacy Vocabulary)
- Main FAQ
- https://creativecommons.org/faq/
- Legal code "Using Creative Commons Public Licenses" subheadings
- for example: https://creativecommons.org/licenses/by/4.0/legalcode
- "Considerations for licensors"
- "Considerations for the public"

## Description
Add support for accordion drop downs

## Additional context
- [Accordion Pattern (Sections With Show/Hide Functionality) | APG | WAI | W3C](https://www.w3.org/WAI/ARIA/apg/patterns/accordion/)

## Implementation

- [ ] I would be interested in implementing this feature.

Start by reviewing the W3C Accordion Pattern linked in the issue and the existing accordion used by the legacy Vocabulary on the LegalDB FAQ. Compare the listed FAQ and legal-code pages, then define support that works for those use cases and meets the referenced show/hide accessibility pattern.

Written by the indexing model from the issue text.