Added linking intents to my original screens

I added linking intents to my 3 original screens, though trying to
access the MapsActivity currently will crash the app (this may have to
do with it being a FragmentActivity). The link from the MainActivity to
Sybil's registration screen is working, however. Remember that you need
to import the View class and the Intent class to your Java files, but
Android Studio will give you a message and automatically import them for
you when prompted.

I encountered some other wonkiness as well and tried to fix it in your
files when possible as well, but if something isn't working for reasons
that don't make sense run it by me, I guess, because I might have run
into it already fixing some of the quirks in other screens.