Docs: add missing Accordion component in the list of JS components

[hannahiss]

Description

Add missing Accordion component in the list of JS components (inheriting of Collapse)

Motivation & Context

Accordion is inheriting from Collapse plugin, so collapse.js should be imported in order to make Accordions work correctly (in case of a js optimized import)

Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would change existing functionality)

Checklist

• I have read the contributing guidelines
• My code follows the code style of the project (using npm run lint)
• My change introduces changes to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

Live previews

• https://deploy-preview-39980--twbs-bootstrap.netlify.app/docs/5.3/getting-started/introduction/#js-components

Related issues

[julien-deramond]

Good catch @hannahiss! LGTM