Rename the `.../rclone/rclone-s3/` page to `.../rclone/rclone-commands`

[RecRanger]

It's very confusing that the .../rclone/rclone-s3/page.md page has nothing to do with S3, and is entirely just a list of commands about using rclone.

I'm not sure how to rename it and probably also prevent the link from breaking, so I'll leave it to someone else.