Docs.

docs/index.rst

@@ -3,16 +3,28 @@
    You can adapt this file completely to your liking, but it should at least
    contain the root `toctree` directive.
 
+.. toctree::
+
 icartt
-====================================
+============================
 
-ICARTT file format reader and writer
+icartt is an ICARTT file format reader and writer
 
-.. toctree::
-   :maxdepth: 2
+.. contents::
+   :local:
 
 .. module:: icartt
 
+API
+----
+
+Variable
+^^^^^^^^^^
+
 .. autoclass:: Variable
 
+
+Dataset
+^^^^^^^^^^
+
 .. autoclass:: Dataset