v0.7.5

• Properly get key from HTML element.
• Removed the buggy implementation of removing uncontrolled head elements. For example if you have a <meta name="description"> in index.html (which is not generated by useHead) and you use useHead to generate the same tag, the pre-existing one will be removed first, but the implementation will incorrectly remove the ones generated by useHead itself too, so this feature is now removed.