put login and signup into tabs on landing page and set up material-ui bootstrap
code clean up for landing page
bug fix log in and sign up tab switching
code fix and hide elements on nav bar when user is not signed in yet
code fix on JS tag on application.html file
Merge pull request #8 from jasonwhlaw/landing_page_styling

Landing Page enhancement
Merge pull request #9 from kshimatsu/birthAnnouncement

Baby avatar edit