small html theme tweaks to unclutter top of page. move version string to navigation bar

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

@@ -1,5 +1,4 @@
 <div role="navigation" aria-label="breadcrumbs navigation">
-  <div style="text-align: center; margin-bottom: -1.5em; display: block"><b>LAMMPS</b> {{ version }}</div>
   <ul class="wy-breadcrumbs">
     <li><a href="{{ pathto(master_doc) }}">Docs</a> &raquo;</li>
       {% for doc in parents %}
@@ -22,7 +21,7 @@
         {% endif %}
       </li>
   </ul>
-  <hr/>
+  <hr width="100%"/>
   {% if next or prev %}
     <div class="rst-footer-buttons" style="margin-bottom: 1em" role="navigation" aria-label="footer navigation">
       {% if next %}

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

@@ -97,6 +97,7 @@
         {% if logo %}
           {# Not strictly valid HTML, but it's the only way to display/scale it properly, without weird scripting or heaps of work #}
           <img src="{{ pathto('_static/' + logo, 1) }}" class="logo" />
+          <div><b>{{ version }}</b></div>
         {% endif %}
         </a>