Add Aesara copyright and fork note.

README.rst

 |Tests Status| |Coverage| |Gitter|
 
-.. raw:: html
-
-  <div align="center">
-  <img src="./doc/images/pytensor_logo_2400.png" alt="logo"></img>
-  </div>
-
-
-|Project Name| is a Python library that allows one to define, optimize, and
+|Project Name| is a fork of Aesara -- a Python library that allows one to define, optimize, and
 efficiently evaluate mathematical expressions involving multi-dimensional
 arrays.
 

doc/LICENSE.txt

@@ -3,13 +3,15 @@
 LICENSE
 =======
 
-Copyright (c) 2008--2019, Theano Development Team
-Copyright (c) 2020-2021, PyMC dev team
-Copyright (c) 2021, Aesara Development Team
+Copyright (c) 2008-2019, Theano Development Team
+Copyright (c) 2020-2021, PyMC Development team
+Copyright (c) 2021-2022, Aesara Development Team
+Copyright (c) 2022, PyMC Development team
 All rights reserved.
 
 Contains code from NumPy, Copyright (c) 2005-2016, NumPy Developers.
-All rights reserved.
+Contains code from Aesara, Copyright (c) 2021-2022, Aesara Developers.
+AAll rights reserved.
 
 theano/scan/*.py[c]: Razvan Pascanu, Frederic Bastien, James Bergstra, Pascal Lamblin, Arnaud Bergeron, PyMC Developers, Pytensor Developers, (c) 2010, Universite de Montreal
 theano/tensor/sharedvar.py: James Bergstra, (c) 2010, Universite de Montreal, 3-clause BSD License