Update app.py

app.py

@@ -52,7 +52,7 @@ def require_api_key(func):
 
 @app.route('/', methods=["GET", "POST"])
 def index():
-    return "vits-simple-api"
+    return render_template("index.html")
 
 
 @app.route('/voice/speakers', methods=["GET", "POST"])