Introduce jinja

app.py

@@ -1,4 +1,4 @@
-from flask import Flask, request, jsonify, send_from_directory
+from flask import Flask, request, jsonify, render_template
 import base64
 import os
 
@@ -6,11 +6,11 @@ app = Flask(__name__)
 
 @app.route('/')
 def index():
-    return send_from_directory(".", "index.html")
+    return render_template('index.html')
 
 @app.route('/feedback',methods=['POST'])
 def feedback():
-    return send_from_directory(".","feedback.html")
+    return render_template("feedback.html")
 
 @app.route('/upload_audio', methods=['POST'])
 def upload_audio():