Refactor: Atomic file read/write for better performance

- Drop dependency atomicwrites

deploy/config.py

@@ -90,6 +90,9 @@ class DeployConfig(ConfigModel):
         logger.info(f"Rest of the configs are the same as default")
 
     def read(self):
+        """
+        Read and update deploy config, copy `self.configs` to properties.
+        """
         self.config = poor_yaml_read(DEPLOY_TEMPLATE)
         self.config_template = copy.deepcopy(self.config)
         origin = poor_yaml_read(self.file)