Fix broken image links in ESnet sphinx theme.

It's been broken for awhile...I'm not sure how it got broken
or why it works after this change.

docs/_esnet/templates/layout.html

@@ -102,7 +102,7 @@
   <div class="container">
     <div class="row">
       <div class="col-md-1">
-        <a href="http://www.es.net/"><img src="_static/esnet/logo-esnet.png" alt="[ESnet]"></a>
+        <a href="http://www.es.net/"><img src="_static/logo-esnet.png" alt="[ESnet]"></a>
       </div>
       <div class="col-md-11">
         <p class="pull-right">

docs/_esnet/templates/navbar.html

@@ -36,7 +36,7 @@
                 <li><a href="{{ pathto(*link[1:]) }}">{{ link[0] }}</a></li>
               {%- endfor %}
             {% endif %}
-            <li><a href="{{ github_url }}"><img src="_static/esnet/icon-github.png" height="20" width="20"></a></li>
+            <li><a href="{{ github_url }}"><img src="_static/icon-github.png" height="20" width="20"></a></li>
             {% block navbarextra %}
             {% endblock %}
             {% if theme_source_link_position == "nav" %}

docs/conf.py

@@ -142,7 +142,7 @@ html_context = {
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+html_static_path = ['_static/esnet']
 
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied