ci: Fix pages pipeline

.gitlab-ci.yml

@@ -27,7 +27,7 @@ pages:
   image: python:slim
   before_script:
     - apt-get update && apt-get install --no-install-recommends -y graphviz imagemagick doxygen make
-    - pip install --upgrade pip && pip install Sphinx Pillow breathe sphinx-rtd-theme m2r2
+    - pip install --upgrade pip && pip install Sphinx Pillow breathe sphinx-rtd-theme sphinx-mdinclude
     - mkdir public
   script:
     - pushd docs_sphinx

docs_sphinx/Grid.rst

@@ -1,4 +0,0 @@
-Grid
-====
-
-.. doxygenclass:: tug::Grid

docs_sphinx/conf.py

@@ -42,7 +42,7 @@ extensions = [
     'sphinx.ext.viewcode',
     'sphinx.ext.inheritance_diagram',
     'breathe',
-    'm2r2'
+    'sphinx_mdinclude'
 ]
 
 html_baseurl = "/index.html"

docs_sphinx/user.rst

@@ -3,6 +3,5 @@ User API
 
 .. toctree::    
   
-    Grid
     Boundary
     Diffusion