Remove Airflow integration (ray-project#27737)

Signed-off-by: Richard Liaw <[email protected]>

Signed-off-by: Richard Liaw <[email protected]>

doc/source/ray-overview/ray-libraries.rst

@@ -6,13 +6,6 @@ Ecosystem
 This page lists libraries that have integrations with Ray for distributed execution.
 If you'd like to add your project to this list, feel free to file a pull request or open an issue on GitHub.
 
-Airflow |airflow|
------------------
-
-Airflow is a platform created by the community to programmatically author, schedule and monitor workflows. The Airflow/Ray integration allows Airflow users to keep all of their Ray code in Python functions and define task dependencies by moving data through python functions.
-
-[`Link to integration <https://registry.astronomer.io/providers/ray>`__] [`Link to announcement <https://www.astronomer.io/blog/airflow-ray-data-science-story>`__]
-
 ClassyVision |classyvision|
 ---------------------------
 
@@ -144,10 +137,6 @@ LightGBM is a high-performance gradient boosting library for classification and
 [`Link to integration <https://github.com/ray-project/lightgbm_ray>`__]
 
 
-.. |airflow| image:: ../images/airflow.png
-    :class: inline-figure
-    :height: 30
-
 .. |classyvision| image:: ../images/classyvision.png
     :class: inline-figure
     :height: 30