Add method to test badge only CSS

Also a small bug fix I found to line-height.

docs/_templates/layout.html

@@ -0,0 +1,55 @@
+{%- extends "!layout.html" %}
+
+{#
+
+This template exists as a way to implement a version menu without changing what
+the theme normally renders the menu on local builds and on builds on Read the
+Docs. This is for local testing purposes only.
+
+#}
+
+{% block footer %}
+  {% if not READTHEDOCS %}
+    <div class="rst-versions" data-toggle="rst-versions" role="note" aria-label="versions">
+      <span class="rst-current-version" data-toggle="rst-current-version">
+        <span class="fa fa-book"> Read the Docs</span>
+        v: latest
+        <span class="fa fa-caret-down"></span>
+      </span>
+      <div class="rst-other-versions">
+        <dl>
+          <dt>{{ _('Versions') }}</dt>
+          {% if test_versions %}
+            {% for version in test_versions %}
+            <dd><a href="#">{{ version }}</a></dd>
+            {% endfor %}
+          {% else %}
+            <dd><a href="#">latest</a></dd>
+            <dd><a href="#">1.0</a></dd>
+            <dd><a href="#">1.1</a></dd>
+          {% endif %}
+        </dl>
+        <dl>
+          <dt>{{ _('Downloads') }}</dt>
+          <dd><a href="#">PDF</a></dd>
+          <dd><a href="#">ePub</a></dd>
+          <dd><a href="#">HTML</a></dd>
+        </dl>
+        <dl>
+          {# Translators: The phrase "Read the Docs" is not translated #}
+          <dt>{{ _('On Read the Docs') }}</dt>
+            <dd>
+              <a href="#">{{ _('Project Home') }}</a>
+            </dd>
+            <dd>
+              <a href="#">{{ _('Builds') }}</a>
+            </dd>
+        </dl>
+        <dl>
+          <dt>Debug</dt>
+          <dd><a href="#" data-toggle="rst-debug-badge">Swap badge position</a></dd>
+        </dl>
+      </div>
+    </div>
+  {% endif %}
+{% endblock %}