rename group command to groups to have consistency into the cli

browser_cli/commands/groups.py

@@ -59,7 +59,7 @@ def _print_groups(groups: list[dict], *, show_browser: bool = False) -> None:
     console.print(table)
 
 
-@click.group("group")
+@click.group("groups")
 def group_group():
     """Manage tab groups."""