Remove file logging, and add existing log level variable to config

roles/custom/matrix-bridge-mautrix-gmessages/templates/config.yaml.j2

@@ -286,13 +286,7 @@ bridge:
 
 # Logging config. See https://github.com/tulir/zeroconfig for details.
 logging:
-    min_level: debug
+    min_level: {{ matrix_mautrix_gmessages_logging_level }}
     writers:
-    - type: stdout
-      format: pretty-colored
-    - type: file
-      format: json
-      filename: ./logs/mautrix-gmessages.log
-      max_size: 100
-      max_backups: 10
-      compress: true
+        - type: stdout
+          format: pretty-colored