major navbar overhaul: .btn-primary.btn-xl now reads CONT GAME and links to the user's most recently active game; log out functionality transferred to new BYE .btn-abandon abutting login spans; tooltips for each asserted via new FTs.test_navbar methods to appear w.in visible area

src/core/settings.py

@@ -102,6 +102,7 @@ TEMPLATES = [
                 'django.contrib.auth.context_processors.auth',
                 'django.contrib.messages.context_processors.messages',
                 'core.context_processors.user_palette',
+                'core.context_processors.navbar_context',
             ],
         },
     },