chore: remove hardcoded ares remote image from config

The Ares agent image version was hardcoded in the configuration, which could become outdated. Removing it allows for more flexible and dynamic image management, potentially through external configuration or defaults.

config.json

@@ -4,7 +4,5 @@
   "exclude_documentation_payload": false,
   "exclude_documentation_c2": false,
   "exclude_agent_icons": false,
-  "remote_images": {
-    "ares": "ghcr.io/mythicagents/ares:v0.0.1.12"
-  }
+  "remote_images": {}
 }