s390x and ppc64le are provided by IBM

Revert "Update sponsor list"

This reverts commit 6a51acb.

Author: hsbt

en/about/website/index.md

@@ -50,6 +50,8 @@ Also many thanks to the organizations that support us:
 
 <img src="../../../images/sponsor/heroku.png" alt="Heroku" width="216" height="256" />
 
+[IBM][ibm] (hosting)
+
 [Fastly][fastly] (CDN)
 
 <img src="../../../images/sponsor/fastly.png" alt="Fastly" width="200" height="200" />
@@ -75,6 +77,7 @@ Also many thanks to the organizations that support us:
 [github-wiki]: https://github.com/ruby/www.ruby-lang.org/wiki
 [rubyassociation]: http://www.ruby.or.jp
 [heroku]: https://www.heroku.com/
+[ibm]: https://www.ibm.com
 [fastly]: http://www.fastly.com
 [hatena]: http://hatenacorp.jp/
 [mackerel]: https://mackerel.io/

ko/about/website/index.md

@@ -52,6 +52,8 @@ lang: ko
 
 <img src="../../../images/sponsor/heroku.png" alt="Heroku" width="216" height="256" />
 
+[IBM][ibm] (호스팅)
+
 [Fastly][fastly] (CDN)
 
 <img src="../../../images/sponsor/fastly.png" alt="Fastly" width="200" height="200" />
@@ -77,6 +79,7 @@ lang: ko
 [github-wiki]: https://github.com/ruby/www.ruby-lang.org/wiki
 [rubyassociation]: http://www.ruby.or.jp
 [heroku]: https://www.heroku.com/
+[ibm]: https://www.ibm.com
 [fastly]: http://www.fastly.com
 [hatena]: http://hatenacorp.jp/
 [mackerel]: https://mackerel.io/

zh_tw/about/website/index.md

@@ -47,6 +47,8 @@ lang: zh_tw
 
 <img src="../../../images/sponsor/heroku.png" alt="Heroku" width="216" height="256" />
 
+[IBM][ibm] (網站托管)
+
 [Fastly][fastly] (CDN)
 
 <img src="../../../images/sponsor/fastly.png" alt="Fastly" width="200" height="200" />
@@ -72,6 +74,7 @@ lang: zh_tw
 [github-wiki]: https://github.com/ruby/www.ruby-lang.org/wiki
 [rubyassociation]: http://www.ruby.or.jp
 [heroku]: https://www.heroku.com/
+[ibm]: https://www.ibm.com
 [fastly]: http://www.fastly.com
 [hatena]: http://hatenacorp.jp/
 [mackerel]: https://mackerel.io/