Added support for accordions

[OmarAmeen01]

Fixes

This Pull Requests added the support for accordions without adding bulky code to the project

• Fixes [Feature] Add support for accordions #55 by @TimidRobot

Technical details

• added following classes and their respective styles for accordion in vocubulary.css

1. .accordion-chevron-active,
2. .accordion-header,
3. .accordion-content,
4. .hidden,
5. .accordion-chevron

• added JavaScript code to support accordion functionality
• added updated documentation on how to use it

Tests

• tested on chrome browser

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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Developer Certificate of Origin

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[possumbilities]

There's good work here, but for the time being see status of initial Issue.

After reviewing possible work directions here, it has become clear that more focused implementation specifications are needed for this to move stably forward. As such this Feature is now blocked by:

• [Functionality] Research, design, and scope an implementation of Accordions for use within the Vocabulary design system #200

I'm leaving this PR open for now, and we'll revisit soon.