[Pennypalooza] - Content changes (#1560)

Small content updates to refer to PennyLane in a less qml-focused way.
General cleanup to fix Sphinx configuration issues/warnings

Author: doctorperceptron

.circleci/config.yml

@@ -30,7 +30,7 @@
 
 project = "PennyLane"
 
-copyright = "2022, Xanadu Quantum Technologies, Inc."
+copyright = "2025, Xanadu Quantum Technologies, Inc."
 
 author = "Xanadu Inc."
 
@@ -39,7 +39,6 @@
 # The full version, including alpha/beta/rc tags
 release = ""
 
-
 # -- General configuration ---------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
@@ -143,7 +142,7 @@
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = "en"
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.