Redirect 4.1.0-preview* docs to ASF archive service

[dongjoon-hyun]

Since 4.1.0 is GA, we can direct previews to reduce the burden in spark-website like we did before.

• Redirect 4.0.0-preview{1,2} docs to ASF archive service #609

$ git log -n1
commit 4058a172ee9ec48a561b0d8c20305659aec03c94 (HEAD -> redirect_410_previews, dongjoon/redirect_410_previews)
Author: Dongjoon Hyun <dongjoon@apache.org>
Date:   Thu Feb 5 16:16:02 2026 -0800

    Redirect 4.1.0-preview* docs to ASF archive service

$ git show 4058a172ee9ec48a561b0d8c20305659aec03c94 --stat | tail -n3
 site/docs/4.1.0-preview4/tuning.html               |   560 -
 site/docs/4.1.0-preview4/web-ui.html               |   681 -
 41719 files changed, 100 insertions(+), 37307043 deletions(-)

[dongjoon-hyun]

cc @yaooqinn and @HyukjinKwon

[dongjoon-hyun]

Ur, it seems that GitHub is unable to show the changed files.

[dongjoon-hyun]

Thank you, @HyukjinKwon . Merged to ash-site.

[dongjoon-hyun]

It's applied correctly.

[yaooqinn]

LGTM

[dongjoon-hyun]

Thank you, @yaooqinn .