Update README.rst

fix styling link text in newcleo hyperlink

README.rst

@@ -21,7 +21,7 @@ a post-processing GUI.
 to be plotted from those available in the *TRANSURANUS* results file.
 
 **TUGUI** is developed by the **Codes & Methods** group of
-`*new*\cleo <https://www.newcleo.com/>`_ and it is released under the
+|newcleo|_ and it is released under the
 **BSD 3-Clause License**.
 
 **DISCLAIMER:** **TUGUI** project must not contain any confidential or
@@ -30,6 +30,9 @@ for the **Transuranus Software Package (Version v1m1j24)** to
 `JRC-EC <https://commission.europa.eu/about-european-commission/departments-and-executive-agencies/joint-research-centre_en>`_.
 **Transuranus Software Package** is not distributed with **TUGUI**.
 
+.. |newcleo| replace:: *new*\cleo
+.. _newcleo: https://www.newcleo.com/
+
 Project Structure
 -----------------
 
@@ -154,4 +157,4 @@ Acknowledgement
 *new*\cleo is thankful to the *TRANSURANUS* development team of
 `JRC-EC Karlsruhe <https://commission.europa.eu/about-european-commission/departments-and-executive-agencies/joint-research-centre_en>`_
 for distributing their software to *new*\cleo and for supporting the
-development of **TUGUI**.
+development of **TUGUI**.