feat: deprecating this package

1.  Add deprecation notice to README.md.
2.  Add warning to `__init__.py`.
3.  Modify `setup.py` URLs and notices.
    -   TODO: check the contact email address.

Author: gvwilson

README.md

@@ -1,4 +1,7 @@
 # chart-studio
+
+> **This project is deprecated as of October 2025.**
+
 The chart-studio Python package contains utilities for interfacing with Plotly's Chart Studio service (both Chart Studio cloud and Chart Studio On-Prem).
 
 Prior to plotly.py version 4, these Chart Studio utilities were included in the `plotly` package under the `plotly.plotly` module. As part of plotly.py version 4, the Chart Studio functionality was removed from the `plotly` package and released in this `chart-studio` package.

chart_studio/__init__.py

@@ -1,2 +1,9 @@
 from __future__ import absolute_import
 from chart_studio import plotly, dashboard_objs, grid_objs, session, tools
+import warnings
+
+warnings.warn(
+    "This package is deprecated as of October 2025.",
+    DeprecationWarning,
+    stacklevel=2
+)

setup.py

@@ -10,14 +10,17 @@ def readme():
 
 setup(
     name="chart-studio",
-    version="1.1.0",
+    version="2.0.0",
     author="Chris P",
     author_email="chris@plot.ly",
-    maintainer="Jon Mease",
-    maintainer_email="jon@plot.ly",
-    url="https://plot.ly/python/",
-    project_urls={"Github": "https://github.com/plotly/chart-studio"},
-    description="Utilities for interfacing with plotly's Chart Studio",
+    maintainer="Plotly Libraries Team",
+    maintainer_email="community@plot.ly",
+    url="https://plot.ly/",
+    project_urls={
+        "Deprecated": "https://github.com/plotly/chart-studio/blob/main/README.md",
+        "Github": "https://github.com/plotly/chart-studio"
+    },
+    description="DEPRECATED: utilities for interfacing with Plotly's Chart Studio",
     long_description=readme(),
     long_description_content_type="text/markdown",
     classifiers=[