Update layout and sphinx version

docs/source/_templates/package.rst_t

@@ -7,7 +7,7 @@
 
 {%- macro toctree(docnames) -%}
 .. toctree::
-   :maxdepth: 6
+   :maxdepth: {{ maxdepth }}
 {% for docname in docnames %}
    {{ docname }}
 {%- endfor %}
@@ -31,8 +31,7 @@ Module contents
 {% endif %}
 
 {%- if submodules %}
-Modules
--------
+
 {% if separatemodules %}
 {{ toctree(submodules) }}
 {%- else %}
@@ -47,8 +46,6 @@ Modules
 
 
 {%- if subpackages %}
-Packages/folders
-----------------
 
 {{ toctree(subpackages) }}
 {% endif %}