[bookkeeper-site] fix latest version of bookkeeper website

### Motivation

After generating website using [script](http://bookkeeper.apache.org/community/release_guide/#update-website), it seems somhow it has updated site with incorrect version. I still have to find out where was the issue while generating the website. But fixing it for now to correct the version on website.

Reviewers: Enrico Olivelli <eolivelli@gmail.com>

This closes #2372 from rdhabalia/fix_site
diff --git a/site/_config.yml b/site/_config.yml
index 2611a83..0e46b0f 100644
--- a/site/_config.yml
+++ b/site/_config.yml
@@ -8,7 +8,6 @@
 twitter_url: https://twitter.com/asfbookkeeper
 
 versions:
-- "4.11.1"
 - "4.11.0"
 - "4.10.0"
 - "4.9.2"
@@ -40,7 +39,7 @@
 - "4.1.0"
 - "4.0.0"
 latest_version: "4.12.0-SNAPSHOT"
-latest_release: "4.11.1"
+latest_release: "4.11.0"
 stable_release: "4.9.2"
 eol_releases:
 - "4.7.3"