Clean up Readme re: file paths

[haggman]

TL;DR

The file paths used in the example don't work for me as written.

Detailed design

Now, I'm integrating these steps into an existing Actions file, doing a bunch of other stuff, if that's any kind of issue. 

In the Readme file example now it shows:


      with:
        path: '/path/to/file'
        destination: 'bucket-name/file'

To get it to actually work, I did:

      with:
        path: 'path/to/file'
        destination: 'bucket-name/folder'

Ditching the initial / on the path, and removing "file" from the destination. With those changes it grabbed the file correctly from the git cloned files, and it the file ended up in the bucket-name/folder location.

### Additional information

_No response_