Remove the _accordions.scss stylesheet

[jamigibbs]

Description

With the va-accordion web component available, we should now be able to replace any usages of the old Formation style classes and remove it from the CSS-Library.

• stylesheets/formation-overrides/components/_accordions.scss

In some situations if an old accordion class is just being used in a single application, it might make sense to move that style directly into vets-website.

Tasks

• Search vets-website, content-build, and next-build for any usages of the old accordion classes
• If there are any left, replace them with va-accordion
• Remove any old CSS-Library accordion stylesheets
• Remove any related assets from the CSS-Library:
  - minus.png
  - minus.svg
  - plus.png
  - plus.svg

Acceptance Criteria

• All places where the old accordion classes are being used have been replaced with va-accordion
• Unused accordion styles and assets have been removed from the CSS-Library

[caw310]

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