Move project description from usage page to home page

docs/source/index.rst

@@ -1,12 +1,9 @@
 Welcome to nvcc4jupyter's documentation!
 ========================================
 
-.. note::
-
-   This project is under active development.
-
-Contents
---------
+This IPython extension allows running CUDA C++ code in Jupyter notebook. This
+is especially useful when combined with `Google Colab <https://colab.research.google.com/>`_
+which provides CUDA capable GPUs with the CUDA toolkit already installed.
 
 .. toctree::
    :maxdepth: 2
@@ -14,10 +11,3 @@ Contents
 
    usage
    magics
-
-Indices and tables
-==================
-
-* :ref:`genindex`
-* :ref:`modindex`
-* :ref:`search`

docs/source/usage.rst

@@ -1,12 +1,6 @@
 Usage
 =====
 
-This IPython extension allows running CUDA C++ code in Jupyter notebook. This
-is especially useful when combined with `Google Colab <https://colab.research.google.com/>`_
-which provides CUDA capable GPUs with the CUDA toolkit already installed.
-
-.. _installation:
-
 Installation
 ------------
 
@@ -16,8 +10,6 @@ To use nvcc4jupyter, first install it using pip:
 
     (venv) $ pip install nvcc4jupyter
 
-.. _load_extension:
-
 Load the Extension
 ------------------