new apps.lyric.urls, .tests.test_views files to test & execute mock email sending; apps.lyric.models, .tests.test_models now test & execute unique token autogen to integrate w. magic link login using only email; core.settings updated w. new urlpatterns to accommodate

src/apps/lyric/urls.py

@@ -0,0 +1,7 @@
+from django.urls import include, path
+from . import views
+
+urlpatterns = [
+    path('send_login_email', views.send_login_email, name='send_login_email'),
+]
+