DOCS Make tutorials index an overview and move todo

doc/source/tutorials/first_model.rst

@@ -364,3 +364,6 @@ this has given you a foundational understanding of the general workflow.
 .. [#coord_minilanguage]
   The description of coordinates follows the simple syntax of the coordinate syntax and the
   :ref:`Topic Guide <coord_mini_language>` explains how that works.
+
+.. todo::
+  Describe modelling of more complicated structures and, e.g., boundary conditions.

doc/source/tutorials/index.rst

@@ -4,13 +4,10 @@
 Tutorials
 =========
 
-.. include:: introduction.rst
+.. toctree::
+  :maxdepth: 2
 
-.. include:: runtime_view.rst
-
-.. include:: first_model.rst
-
-.. todo::
-    Describe modelling of more complicated structures and, e.g., boundary conditions.
-
-.. include:: run_model.rst
+  introduction
+  runtime_view
+  first_model
+  run_model