fix show prompt formatting

src/app.py

@@ -73,6 +73,7 @@ def on_show_prompt_click(criteria, context, user_message, assistant_message, sta
     messages = get_messages(test_case=test_case, sub_catalog_name=state['selected_sub_catalog'])
     prompt = get_prompt(messages, criteria_name)
     prompt = json.dumps(prompt, indent=4)
+    prompt = prompt.replace('<', '&lt;').replace('>', '&gt;').replace('\\n', '<br>')
     return gr.Markdown(prompt)
 
 ibm_blue = gr.themes.Color(