Remove license in doc/index.rst (py-why#14)

BSD is not the right license and in another part of this file the correct one is listed by linking to the LICENSE.md file, which avoids the redundance.

Signed-off-by: Peter Goetz <pego@amazon.com>

Signed-off-by: Peter Goetz <pego@amazon.com>
Signed-off-by: Adam Li <adam2392@gmail.com>

Author: petergtz

docs/index.rst

@@ -30,12 +30,6 @@ Team
 To learn more about who specifically contributed to this codebase, see
 `our contributors <https://github.com/py-why/pywhy-graphs/graphs/contributors>`_ page.
 
-License
--------
-
-**pywhy-graphs** is licensed under `MIT <https://opensource.org/licenses/MIT>`_.
-A full copy of the license can be found `on GitHub <https://github.com/py-why/pywhy-graphs/blob/main/LICENSE>`_.
-
 Indices and tables
 ------------------