Tweak copy to remove remaining uses of sign up (#7987)

* tweak copy in Deactivated.tsx

* tweak copy in Policies.tsx

* tweak comment in createNativeStackNavigatorWithAuth.tsx

* tweak copy in LoginForm.tsx

* tweak copy in StarterPackLandingScreen.tsx

* format

* Apply suggestions from code review

Co-authored-by: Hailey <hailey@blueskyweb.xyz>

* Update src/screens/StarterPack/StarterPackLandingScreen.tsx

Co-authored-by: surfdude29 <149612116+surfdude29@users.noreply.github.com>

* Update src/screens/StarterPack/StarterPackLandingScreen.tsx

Co-authored-by: surfdude29 <149612116+surfdude29@users.noreply.github.com>

---------

Co-authored-by: Hailey <hailey@blueskyweb.xyz>

src/view/shell/createNativeStackNavigatorWithAuth.tsx

@@ -137,7 +137,7 @@ function NativeStackNavigator({
   }
 
   // Show the bottom bar if we have a session only on mobile web. If we don't have a session, we want to show it
-  // on both tablet and mobile web so that we see the sign up CTA.
+  // on both tablet and mobile web so that we see the create account CTA.
   const showBottomBar = hasSession ? isMobile : isTabletOrMobile
 
   return (