feat: introduce skill management tool for agent-created skills and skills migration to ~/.hermes

- Added a new `skill_manager_tool` to enable agents to create, update, and delete their own skills, enhancing procedural memory capabilities.
- Updated the skills directory structure to support user-created skills in `~/.hermes/skills/`, allowing for better organization and management.
- Enhanced the CLI and documentation to reflect the new skill management functionalities, including detailed instructions on creating and modifying skills.
- Implemented a manifest-based syncing mechanism for bundled skills to ensure user modifications are preserved during updates.

hermes_cli/skills_hub.py

@@ -186,7 +186,7 @@ def do_install(identifier: str, category: str = "", force: bool = False,
             "External skills can contain instructions that influence agent behavior,\n"
             "shell commands, and scripts. Even after automated scanning, you should\n"
             "review the installed files before use.\n\n"
-            f"Files will be at: [cyan]skills/{category + '/' if category else ''}{bundle.name}/[/]",
+            f"Files will be at: [cyan]~/.hermes/skills/{category + '/' if category else ''}{bundle.name}/[/]",
             title="Disclaimer",
             border_style="yellow",
         ))