Add speaking endpoints and clean code.

sp1_playground.py

@@ -38,18 +38,14 @@ def correct_answer(
                     "content": f"The question you have to grade is of type {question_type} and is the following: {question}",
                 },
                 {
-                    "role": "system",
+                    "role": "user",
                     "content": "Please provide a JSON object response with the overall grade and breakdown grades, "
                                "formatted as follows: {'overall': 7.0, 'task_response': {'Fluency and Coherence': 8.0, "
                                "'Lexical Resource': 6.5, 'Grammatical Range and Accuracy': 7.5, 'Pronunciation': "
                                "6.0}}",
                 },
                 {
-                    "role": "system",
-                    "content": "Don't give explanations for the grades, just provide the json with the grades.",
-                },
-                {
-                    "role": "system",
+                    "role": "user",
                     "content": "If the answer is unrelated to the question give it the minimum grade.",
                 },
                 {