localStorage to not loose answers on reaload

[qknight]

we could use localStorage so that page reloads won't use your answers.

https://blog.logrocket.com/localstorage-javascript-complete-guide/#localstorage-vs-cookies

• []storage local answers
• [] updates on questions.json will reset parts of that
• [] add clean all button

https://github.com/leptos-rs/leptos/discussions/1903#discussioncomment-7303836