feat: Add additional teaching types external & flipped_classroom

src/components/enums/teaching-type.yaml

@@ -10,3 +10,11 @@ oneOf:
   - title: Hybrid
     const: hybrid
     description: Both on site and online
+  - title: External
+    const: external
+    description: Taught at an external location.
+  - title: Flipped Classroom
+    const: flipped_classroom
+    description: |
+      Both on site and online, where the students learn at home and come back with
+      questions