Accordion: inconsistent border bottom

[tanguilp]

In some variants (like base), only the first items has a bottom border:

Visible in the doc: https://mishka.tools/chelekom/docs/accordion/#base-variant

[MonaAghili]

@tanguilp this component has some bugs so I think it needs to be completely reimplemented
please do not use it in production until it's been properly fixed or rewritten