Add documentation for useStorage

Merge Request

💣 Breaking Changes

🥅 Description

This is some documentation on the usage of the useStorage method from VueUse which has already been used in the old frontend and was now taken over into the nuxtend.

📷 Screenshot

📓 Checklist

• The code compiles without any warnings.
• I followed the code review checklist.
• The documentation has been added/updated.

🔗 Related Issues

• Related #
• Closes #