improve the cite

Author: simongravelle

docs/sphinx/source/shared/cite.rst

@@ -1 +1,8 @@
-If these tutorials are useful to you, please cite Ref. :cite:`gravelle2025tutorials`.
+If you find these tutorials useful for your research or simulations, you can
+cite: A Set of Tutorials for the LAMMPS Simulation Package" by Simon Gravelle,
+Jacob R. Gissinger, and Axel Kohlmeyer (2025) :cite:`gravelle2025tutorials`. You
+can access the full paper on |gravelle2025tutorials_arXiv|.
+
+.. |gravelle2025tutorials_arXiv| raw:: html
+
+    <a href="https://doi.org/10.48550/arXiv.2503.14020" target="_blank">arXiv</a>

docs/sphinx/source/tutorial1/introduction.rst

@@ -1,14 +1,14 @@
 .. figure:: avatars/lennard-jones-fluid-avatar-dark.webp
     :alt: The binary mixture simulated during Tutorial 1. The atoms of type 1 are
           represented as small green spheres and the atoms of type 2 as large blue spheres.
-    :height: 250
+    :height: 220
     :align: right
     :class: only-dark
 
 .. figure:: avatars/lennard-jones-fluid-avatar-light.webp
     :alt: The binary mixture simulated during Tutorial 1. The atoms of type 1 are
           represented as small green spheres and the atoms of type 2 as large blue spheres.
-    :height: 250
+    :height: 220
     :align: right
     :class: only-light