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/main.js

@@ -6,10 +6,12 @@ import BooksBrowser from './BooksBrowser.vue'
 import AddBook from './AddBook.vue'
 import SignUp from './SignUp.vue'
 import LogIn from './LogIn.vue'
+import Home from './Home.vue'
 
 
 const routes = [
-  { path: '/', component: BooksBrowser },
+  { path: '/', component: Home },
+  { path: '/books', component: BooksBrowser },
   { path: '/add', component: AddBook },
   { path: '/signup', component: SignUp },
   { path: '/login', component: LogIn },