[SPARK-35645][PYTHON][DOCS] Merge contents and remove obsolete pages …

…in Getting Started section ### What changes were proposed in this pull request? This PR revise the installation to describe `pip install pyspark[pandas_on_spark]` and removes pandas-on-Spark installation and videos/blogposts. ### Why are the changes needed? pandas-on-Spark installation is merged to PySpark installation pages. For videos/blogposts, now this is named pandas API on Spark. Old Koalas blogposts and videos are obsolete. ### Does this PR introduce _any_ user-facing change? To end users, no because the docs are not released yet. ### How was this patch tested? I manually built the docs and checked the output Closes #33018 from HyukjinKwon/SPARK-35645. Authored-by: Hyukjin Kwon <gurwls223@apache.org> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
apache · Jun 22, 2021 · 2704658 · 2704658
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diff --git a/python/docs/source/getting_started/index.rst b/python/docs/source/getting_started/index.rst
@@ -25,18 +25,12 @@ There are more guides shared with other languages such as
 `Quick Start <https://spark.apache.org/docs/latest/quick-start.html>`_ in Programming Guides
 at `the Spark documentation <https://spark.apache.org/docs/latest/index.html#where-to-go-from-here>`_.
 
+.. TODO(SPARK-35588): Merge PySpark quickstart and 10 minutes to pandas API on Spark.
+
 .. toctree::
    :maxdepth: 2
 
    install
    quickstart
-
-For pandas API on Spark:
-
-.. toctree::
-   :maxdepth: 2
-
-   ps_install
    ps_10mins
-   ps_videos_blogs
 
diff --git a/python/docs/source/getting_started/install.rst b/python/docs/source/getting_started/install.rst
@@ -46,7 +46,10 @@ If you want to install extra dependencies for a specific component, you can inst
 
 .. code-block:: bash
 
+    # Spark SQL
     pip install pyspark[sql]
+    # pandas API on Spark
+    pip install pyspark[pandas_on_spark]
 
 For PySpark with/without a specific Hadoop version, you can install it by using ``PYSPARK_HADOOP_VERSION`` environment variables as below:
 

diff --git a/python/docs/source/getting_started/ps_install.rst b/python/docs/source/getting_started/ps_install.rst
diff --git a/python/docs/source/getting_started/ps_videos_blogs.rst b/python/docs/source/getting_started/ps_videos_blogs.rst