DOC: simplify README header

README.rst

@@ -2,7 +2,8 @@
 audb
 ====
 
-|tests| |coverage| |docs| |python-versions| |license|
+|docs| | |python-versions| | |license| | |paper|
+
 
 **audb** manages your annotated media files.
 
@@ -25,47 +26,16 @@ e.g. if you just want to download the test set.
 Have a look at the installation_ and quickstart_ instructions.
 
 
-Citation
---------
-
-If you want to cite **audb**, you can refer to our paper_:
-
-.. code-block:: bibtex
-
-    @article{wierstorf2023audb,
-      title={audb -- Sharing and Versioning of Audio and Annotation Data in Python},
-      author={Hagen Wierstorf
-        and Johannes Wagner
-        and Florian Eyben
-        and Felix Burkhardt
-        and Bj{\"o}rn W. Schuller},
-      journal={arXiv preprint arXiv:2303.00645},
-      year={2023},
-    }
-
-
 .. _Artifactory: https://jfrog.com/artifactory/
 .. _common format: https://audeering.github.io/audformat/
 .. _installation: https://audeering.github.io/audb/install.html
 .. _MinIO: https://min.io
-.. _paper: https://arxiv.org/abs/2303.00645
 .. _quickstart: https://audeering.github.io/audb/quickstart.html
 .. _S3: https://aws.amazon.com/s3/
 
 
-.. badges images and links:
-.. |tests| image:: https://github.com/audeering/audb/workflows/Test/badge.svg
-    :target: https://github.com/audeering/audb/actions?query=workflow%3ATest
-    :alt: Test status
-.. |coverage| image:: https://codecov.io/gh/audeering/audb/branch/main/graph/badge.svg?token=drrULW8vEG
-    :target: https://codecov.io/gh/audeering/audb/
-    :alt: code coverage
-.. |docs| image:: https://img.shields.io/pypi/v/audb?label=docs
-    :target: https://audeering.github.io/audb/
-    :alt: audb's documentation
-.. |license| image:: https://img.shields.io/badge/license-MIT-green.svg
-    :target: https://github.com/audeering/audb/blob/main/LICENSE
-    :alt: audb's MIT license
-.. |python-versions| image:: https://img.shields.io/pypi/pyversions/audb.svg
-    :target: https://pypi.org/project/audb/
-    :alt: audbs's supported Python versions
+.. header links:
+.. |docs| replace:: `📚Documentation <https://audeering.github.io/audb/>`__
+.. |license| replace:: `📜 MIT license <https://github.com/audeering/audb/blob/main/LICENSE>`__
+.. |python-versions| replace:: `🐍 Python 3.9, 3.10, 3.11, 3.12, 3.13 <https://pypi.org/project/audb/>`__
+.. |paper| replace:: `📑 Paper <https://arxiv.org/abs/2303.00645/>`__