Update checkbox

[yichiang]

Enable Select checkbox without jumping out of the page.

Change the data structure on index.js.

(Ref will trigger render whole application and thus disengaged the userArtice table from Index.js )

database.ref('news').on('value', snapshot => {
    const newsStore = snapshot.val();
    database.ref('users').on('value', snapshot => {
      const usersStore = snapshot.val();
      database.ref('userBooks').on('value', snapshot => {
        const userBooksStore = snapshot.val();
.....
      );
    });

I tried to find firebase API to ref selected table, but unfortunately, I haven't find it

@geetotes Hi Lee, check there is any problem if you might merge to master. Thank you.