Add back definition after calling.

README.rst

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 |github| |tests| |docs| |codecov| |pypi| |licence| |arxiv1| |arxiv2| |arxiv3| |arxiv4|
 
 
-.. image:: ./docs/assets/harm_badge_simple.svg
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+|logo| Harmonic
 
-Harmonic
+.. |logo| image:: /docs/assets/harm_badge_simple.svg
+    :width: 32
 =================================================================================================================
 
 ``harmonic`` is an open source, well tested and documented Python implementation of the *learnt harmonic mean estimator* (`McEwen et al. 2021 <https://arxiv.org/abs/2111.12720>`_) to compute the marginal likelihood (Bayesian evidence), required for Bayesian model selection.