Update copyright and remove blank lines in docs.

Author: moorepants

docs/conf.py

@@ -53,7 +53,7 @@
 
 # General information about the project.
 project = 'opty'
-copyright = '2020, opty authors'
+copyright = '2014-2023, opty authors'
 author = 'Jason K. Moore'
 
 # The version info for the project you're documenting, acts as replacement for
@@ -160,6 +160,3 @@
      author, 'opty', 'One line description of project.',
      'Miscellaneous'),
 ]
-
-
-

docs/theory.rst

@@ -192,4 +192,3 @@ References
    Using Nonlinear Programming. Advances in Design and Control. Society for
    Industrial and Applied Mathematics, 2010.
    https://doi.org/10.1137/1.9780898718577.
-