Keep version in header, only show selector if LAMMPS_WEBSITE_BUILD is set

doc/utils/sphinx-config/_themes/lammps_theme/layout.html

@@ -138,6 +138,10 @@
             {% if READTHEDOCS and current_version %}
               {%- set nav_version = current_version %}
             {% endif %}
+            {% if nav_version %}
+              <div class="lammps_version">Version: <b>{{ nav_version }}</b></div>
+              <div class="lammps_release">git info: {{ release }}</div>
+            {% endif %}
           {% endif %}
 
           {% include "searchbox.html" %}