feat: migrate backend to cosmiconfig

backend/backend/config/default/app/index.js

@@ -0,0 +1,27 @@
+import userGroupSetting from './user-group-setting.js';
+import languageSetting from './language-setting.js';
+import menus from './menu.js';
+
+/** @type {import('@openstapps/core').SCAppConfiguration} */
+const app = {
+  aboutPages: {},
+  campusPolygon: {
+    coordinates: [
+      [
+        [8.660_432_999_690_723, 50.123_027_017_044_436],
+        [8.675_496_285_518_358, 50.123_027_017_044_436],
+        [8.675_496_285_518_358, 50.130_661_764_486_42],
+        [8.660_432_999_690_723, 50.130_661_764_486_42],
+        [8.660_432_999_690_723, 50.123_027_017_044_436],
+      ],
+    ],
+    type: 'Polygon',
+  },
+  features: {},
+  menus,
+  name: 'Goethe-Uni',
+  privacyPolicyUrl: 'https://mobile.server.uni-frankfurt.de/_static/privacy.md',
+  settings: [userGroupSetting, languageSetting],
+};
+
+export default app;