fix path

Makefile

@@ -3,6 +3,13 @@ MAKEFLAGS += s
 
 .PHONY: serve
 serve: 
-	@echo "\n 🌎  preview at: \033[1m https://${BASE}${JUPYTERHUB_SERVICE_PREFIX}proxy/8501/index.html \033[0m \n"
-	streamlit run app.py 1> /dev/null 2>&1
+	@echo "\n 🌎  preview at: \033[1m https://${BASE}${JUPYTERHUB_SERVICE_PREFIX}proxy/8501/ \033[0m \n"
+	streamlit run app.py --server.port 8501  1> /dev/null 2>&1
+
+
+.PHONY: chat 
+chat: 
+	@echo "\n 🌎  preview at: \033[1m https://${BASE}${JUPYTERHUB_SERVICE_PREFIX}proxy/8501/ \033[0m \n"
+	streamlit run chat.py --server.port 8501  1> /dev/null 2>&1
+