Change target path of update-link-index action (#252)

As agreed, change the path from `/{repo}.json` to
`/{org}/{repo}/{branch}/links.json`

Author: reakaleek

actions/update-link-index/action.yml

@@ -51,5 +51,4 @@ runs:
       env:
         LINK_REFERENCE_FILE: ${{ inputs.link_reference_file }}
       run: |
-        repository_name=$(basename "${GITHUB_REPOSITORY}")
-        aws s3 cp "${LINK_REFERENCE_FILE}" "s3://${{ inputs.aws_s3_bucket_name }}/${repository_name}.json"
+        aws s3 cp "${LINK_REFERENCE_FILE}" "s3://${{ inputs.aws_s3_bucket_name }}/${GITHUB_REPOSITORY}/${GITHUB_REF_NAME}/links.json"