Fix the badges on the citing page, again (#175)

Author: seisman

cite/index.md

@@ -11,16 +11,16 @@ Furthermore, you are welcome to cite the specific version you have used in your
 
 The GMT releases are:
 
-- **latest / all**: [![](https://img.shields.io/badge/10.5281/zenodo.3407865-DOI-blue.svg)](https://doi.org/10.5281/zenodo.3407865)
-- **6.7.0**: [![](https://img.shields.io/badge/10.5281/zenodo.19398868-DOI-blue.svg)](https://doi.org/10.5281/zenodo.19398868)
-- **6.6.0**: [![](https://img.shields.io/badge/10.5281/zenodo.16448627-DOI-blue.svg)](https://doi.org/10.5281/zenodo.16448627)
-- **6.5.0**: [![](https://img.shields.io/badge/10.5281/zenodo.10119499-DOI-blue.svg)](https://doi.org/10.5281/zenodo.10119499)
-- **6.4.0**: [![](https://img.shields.io/badge/10.5281/zenodo.6623271-DOI-blue.svg)](https://doi.org/10.5281/zenodo.6623271)
-- **6.3.0**: [![](https://img.shields.io/badge/10.5281/zenodo.5708769-DOI-blue.svg)](https://doi.org/10.5281/zenodo.5708769)
-- **6.2.0**: [![](https://img.shields.io/badge/10.5281/zenodo.4900001-DOI-blue.svg)](https://doi.org/10.5281/zenodo.4900001)
-- **6.1.1**: [![](https://img.shields.io/badge/10.5281/zenodo.4010996-DOI-blue.svg)](https://doi.org/10.5281/zenodo.4010996)
-- **6.1.0**: [![](https://img.shields.io/badge/10.5281/zenodo.3924517-DOI-blue.svg)](https://doi.org/10.5281/zenodo.3924517)
-- **6.0.0**: [![](https://img.shields.io/badge/10.5281/zenodo.3407866-DOI-blue.svg)](https://doi.org/10.5281/zenodo.3407866)
+- **latest / all**: [![](https://img.shields.io/badge/DOI-10.5281/zenodo.3407865-blue.svg)](https://doi.org/10.5281/zenodo.3407865)
+- **6.7.0**: [![](https://img.shields.io/badge/DOI-10.5281/zenodo.19398868-blue.svg)](https://doi.org/10.5281/zenodo.19398868)
+- **6.6.0**: [![](https://img.shields.io/badge/DOI-10.5281/zenodo.16448627-blue.svg)](https://doi.org/10.5281/zenodo.16448627)
+- **6.5.0**: [![](https://img.shields.io/badge/DOI-10.5281/zenodo.10119499-blue.svg)](https://doi.org/10.5281/zenodo.10119499)
+- **6.4.0**: [![](https://img.shields.io/badge/DOI-10.5281/zenodo.6623271-blue.svg)](https://doi.org/10.5281/zenodo.6623271)
+- **6.3.0**: [![](https://img.shields.io/badge/DOI-10.5281/zenodo.5708769-blue.svg)](https://doi.org/10.5281/zenodo.5708769)
+- **6.2.0**: [![](https://img.shields.io/badge/DOI-10.5281/zenodo.4900001-blue.svg)](https://doi.org/10.5281/zenodo.4900001)
+- **6.1.1**: [![](https://img.shields.io/badge/DOI-10.5281/zenodo.4010996-blue.svg)](https://doi.org/10.5281/zenodo.4010996)
+- **6.1.0**: [![](https://img.shields.io/badge/DOI-10.5281/zenodo.3924517-blue.svg)](https://doi.org/10.5281/zenodo.3924517)
+- **6.0.0**: [![](https://img.shields.io/badge/DOI-10.5281/zenodo.3407866-blue.svg)](https://doi.org/10.5281/zenodo.3407866)
 
 The articles on GMT are: