Docs: replace broken DOI badge with RST for redirected DOI badge

Author: sadielbartholomew

docs/source/introduction.rst

@@ -35,7 +35,9 @@ is built on a complete implementation of the :ref:`CF-data-model`.
 
 **Functionality**
 -----------------
-<a href="https://doi.org/10.5281/zenodo.14274886"><img src="https://zenodo.org/badge/DOI/https://doi.org/10.5281/zenodo.14274886" alt="DOI"></a>
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+.. image:: https://zenodo.org/badge/DOI/10.5281/zenodo.14275599.svg
+  :target: https://doi.org/10.5281/zenodo.14275599
 
 The `cf` package implements the :ref:`CF-data-model` for its internal
 data structures and so is able to process any CF-compliant dataset. It