Remove maintainability badge (#1375)

Author: fepegar

README.md

@@ -58,9 +58,6 @@ at [OpenAI](https://openai.com/) ([link](https://jack-clark.net/2020/03/17/)).
             <a href="https://scrutinizer-ci.com/g/TorchIO-project/torchio/?branch=main">
                 <img src="https://img.shields.io/scrutinizer/g/TorchIO-project/torchio.svg?label=Code%20quality&logo=scrutinizer" alt="Code quality">
             </a>
-            <a href="https://codeclimate.com/github/TorchIO-project/torchio">
-                <img src="https://api.codeclimate.com/v1/badges/518673e49a472dd5714d/maintainability" alt="Code maintainability">
-            </a>
             <a href="https://github.com/pre-commit/pre-commit">
                 <img src="https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit&logoColor=white" alt="pre-commit">
             </a>

docs/source/README.rst

@@ -4,7 +4,7 @@ TorchIO
 
 |PyPI-downloads| |PyPI-version| |Conda-version| |Google-Colab-notebook|
 |Docs-status| |Tests-status| |Ruff|
-|Coverage-codecov| |Code-Quality| |Code-Maintainability| |pre-commit|
+|Coverage-codecov| |Code-Quality| |pre-commit|
 |YouTube|
 
 
@@ -109,10 +109,6 @@ If you found a bug or have a feature request, please open an issue:
    :target: https://github.com/TorchIO-project/torchio#contributors
    :alt: All contributors
 
-.. |Code-Maintainability| image:: https://api.codeclimate.com/v1/badges/518673e49a472dd5714d/maintainability
-   :target: https://codeclimate.com/github/TorchIO-project/torchio
-   :alt: Maintainability
-
 .. |pre-commit| image:: https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit&logoColor=white
    :target: https://github.com/pre-commit/pre-commit
    :alt: pre-commit