PivotControls docs link to a sandbox of a fork, not what's in repo

[jelling]

drei/docs/gizmos/pivot-controls.mdx

Line 10 in aa0f742

<Codesandbox id="om2ff8" />

The docs are linking to a sandbox that has @drcmda 's fork of the PivotControls to add an object property. But as far as I can tell, this code was never in the Drei repo itself.

The object property may be a good idea, although so far I can't tell if there is a benefit over using the matrix property.