docs: Add CollapsedWave to showcase.md (#643)

migueltorrescosta

2023-12-20 be76da9e95b6744f4934280cb85504371ccc1244

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code[data-theme*=" "] {
  color: var(--shiki-light);
  background-color: var(--shiki-light-bg);
}
 
code[data-theme*=" "] span {
  color: var(--shiki-light);
}
 
[saved-theme="dark"] code[data-theme*=" "] {
  color: var(--shiki-dark);
  background-color: var(--shiki-dark-bg);
}
 
[saved-theme="dark"] code[data-theme*=" "] span {
  color: var(--shiki-dark);
}