new FT test_theme for theme switcher functionality; theme-switcher content added to home.html, several dashboard views & urls, all appropriate ITs & UTs; lyric user model saves theme (migrations run); django-compressor and django-libsass libraries added to dependencies

src/apps/lyric/tests/integrated/test_models.py

@@ -50,3 +50,8 @@ class UserManagerTest(TestCase):
             password="correct-password",
         )
         self.assertTrue(user.check_password("correct-password"))
+
+class UserThemeTest(TestCase):
+    def test_theme_field_defaults_to_theme_default(self):
+        user = User.objects.create(email="a@b.cde")
+        self.assertEqual(user.theme, "theme-default")