[docs] Add Options/Composition API Toggle Button

[angelhdzdev]

I don't know if this was discussed before, I'm listening to the "The Mastering Pinia Course" talk while writing this 🎧😁

It would be nice if as with Vue docs, we included a toggle button to filter the docs by Options API and Composition API (Setup Function).

Setup Function needs more love! 💚💛🔥😍