fix!: remove default margin

[sebastian-altamirano]

This PR removes the default margin applied to SVGs.

This library should not enforce spacing constraints. Whether to add spacing - and how much - should be entirely up to the developer.

THIS IS A BREAKING CHANGE: Some users may have relied on the default spacing. After updating, they will experience minor visual changes, as the SVGs will be slightly smaller. They may experience layout shifts, depending on how their UI was designed, since extra space could now be occupied by unexpected elements.