feat: add Kaggle organization badge (#727)

* feat: add Kaggle organization badge to README

* feat: change Kaggle badge style from plastic to flat

matches style of existing badges

Author: dsmedia

README.md

@@ -3,6 +3,7 @@
 [![npm version](https://img.shields.io/npm/v/vega-datasets.svg)](https://www.npmjs.com/package/vega-datasets)
 [![Build Status](https://github.com/vega/vega-datasets/workflows/Test/badge.svg)](https://github.com/vega/vega-datasets/actions)
 [![](https://data.jsdelivr.com/v1/package/npm/vega-datasets/badge?style=rounded)](https://www.jsdelivr.com/package/npm/vega-datasets)
+[![Kaggle](https://img.shields.io/badge/Kaggle-035a7d?style=flat&logo=kaggle&logoColor=white)](https://www.kaggle.com/organizations/vega-datasets)
 
 Vega Datasets is the centralized hub for over 70 datasets featured in the examples and documentation of Vega, Vega-Lite, Altair and related projects. A dataset catalog conforming to the [Data Package Standard v2](https://datapackage.org/blog/2024-06-26-v2-release/) provides information on data structure, sourcing, and licensing. Generation scripts document data provenance and transformation, enabling reproducibility and transparency throughout the data preparation process. Each dataset is curated to illustrate essential visualization concepts, statistical methods, or domain-specific applications.
 
@@ -132,4 +133,4 @@ The repository code is licensed under the BSD-3-Clause License. Note that indivi
 
 ## Acknowledgments
 
-Appreciation is extended to the numerous organizations and individuals who have generously shared their data for use in this collection.
+Appreciation is extended to the numerous organizations and individuals who have generously shared their data for use in this collection.