Reorganize and cleanup

src/screens/index.js

@@ -0,0 +1,7 @@
+export { default as Home } from './Home';
+export { default as Login } from './Login';
+export { default as Register } from './Register';
+export { default as Dashboard } from './Dashboard';
+export { default as Invite } from './Invite';
+export { default as Availability } from './Availability';
+export { default as Schedule } from './Schedule';