Fix documentation template

docs/theme/nav.html

 {%- if nav_item.url %}
 {%- if nav_item.url %}
-    <a class="{% if nav_item.active%}current{%endif%}" href="{{ nav_item.url }}">{{ nav_item.title }}</a>
+<a class="{% if nav_item.active%}current{%endif%}" href="{{ base_url }}/{{ nav_item.url }}">{{ nav_item.title }}</a>
 {%- else %}
 {%- else %}
-    <span class="caption-text">{{ nav_item.title }}</span>
+<span class="caption-text">{{ nav_item.title }}</span>
 {%- endif %}
 {%- endif %}
 
 
 {%- if nav_item == page or nav_item.children %}
 {%- if nav_item == page or nav_item.children %}
-    <ul class="subnav">
+<ul class="subnav">
     {%- if nav_item == page %}
     {%- if nav_item == page %}
     {% include 'toc.html' %}
     {% include 'toc.html' %}
     {%- endif %}
     {%- endif %}
@@ -18,5 +18,5 @@
     {%- endfor %}
     {%- endfor %}
     {%- set navlevel = navlevel - 1%}
     {%- set navlevel = navlevel - 1%}
     {%- endif %}
     {%- endif %}
-    </ul>
+</ul>
 {%- endif %}
 {%- endif %}

docs/theme/toc.html

 {% for toc_item in page.toc %}
 {% for toc_item in page.toc %}
-    <!--<li class="toctree-l{{ navlevel + 1 }}"><a href="{{ toc_item.url }}">{{ toc_item.title }}</a></li>-->
-    {% if toc_item.children %}
-        <ul>
+<!--<li class="toctree-l{{ navlevel + 1 }}"><a href="{{ toc_item.url }}">{{ toc_item.title }}</a></li>-->
+{% if toc_item.children %}
+<ul>
     {% for toc_item in toc_item.children %}
     {% for toc_item in toc_item.children %}
     <li><a class="toctree-l{{ navlevel + 2 }}" href="{{ toc_item.url }}">{{ toc_item.title }}</a></li>
     <li><a class="toctree-l{{ navlevel + 2 }}" href="{{ toc_item.url }}">{{ toc_item.title }}</a></li>
     {% endfor %}
     {% endfor %}
-        </ul>
-    {% endif %}
+</ul>
+{% endif %}
 {% endfor %}
 {% endfor %}