Now dump new instances in config

src/settings.py

@@ -90,6 +90,13 @@ def get_config(key):
         return loaded_config.get(key)
 
 
+def set_config(key, value):
+    '''set value new value config by key'''
+    read_conf = check_config()
+    with open(conf_file, 'wt') as f:
+        read_conf[key] = value
+        f.write(json.dumps(read_conf, indent=4))
+
 @logger.catch
 def get_new_funkwhale_servers():
     # Uses official API network.funkwhale.audio for getting new instances