xlink support should be dropped

[KarlKl]

According to MDN docs for href, all browsers support the normal href directive since a few years now. Safari was the last one and they also support it since 2019. According to the MDN Docs for xlink:href the support for that will or can be dropped at any time and therefore the xlink:href should be removed or should only be used as a fallback.

Your library currently only uses xlink:href in the <use> tag.