chore: optimize logging. separate bot log and web log.

configuration.example.ini

@@ -93,6 +93,9 @@ port = 64738
 #listening_port = 8181
 #is_web_proxified = True
 
+# 'web_logfile': write access logs of the web server into this file.
+#web_logfile =
+
 # 'required_auth': Set this to True to enable password protection for the web interface.
 #require_auth = False
 #user =