feat(configuration): support multiple vaults in the configuration file (#6)

When multiple vaults are added to the configuration file, the script will prompt 
you to select one at runtime

src/obsidian_metadata/_utils/utilities.py

@@ -1,7 +1,6 @@
 """Utility functions."""
 import re
 from os import name, system
-from pathlib import Path
 from typing import Any
 
 import typer
@@ -83,17 +82,6 @@ def version_callback(value: bool) -> None:
         raise typer.Exit()
 
 
-def vault_validation(path: str) -> bool | str:
-    """Validates the vault path."""
-    path_to_validate: Path = Path(path).expanduser().resolve()
-    if not path_to_validate.exists():
-        return f"Path does not exist: {path_to_validate}"
-    if not path_to_validate.is_dir():
-        return f"Path is not a directory: {path_to_validate}"
-
-    return True
-
-
 def docstring_parameter(*sub: Any) -> Any:
     """Decorator to replace variables within docstrings.