Integrate users and books

- new table userbook linking users and book
- moved rating to users book
- updated demo data and tests
- updated front to hide routes from non connected users

front/src/BooksBrowser.vue

@@ -1,8 +1,8 @@
 <script setup>
 import BookCard from './BookCard.vue';
-import { getBooks } from './api.js'
+import { getMyBooks } from './api.js'
 
-const { data, error } = getBooks();
+const { data, error } = getMyBooks();
 
 </script>