After, Before are 1-Indexed Instead of 0-indexed

I would suggest a change, but this would break a lot of stuff. Therefore, I suggest changing the documentation to reflect that it's 1-indexed, as this is confusing and I thought it wasn't working (I was doing before:1 assuming it would give me the first item as a collection but it gave me nothing instead. Don't suggest "first," as I wanted a collection to run through a template and then had after:1 going through the same template)

Find the documentation for the 'after' and 'before' filters in the project's README or docs. Update the text to clearly state they are 1-indexed. Verify by checking the filter implementation in the source code to confirm the indexing behavior.

Escrita pelo modelo de indexação a partir do texto da issue.