I understand is a good idea to have revision support when the blog is maintained by multiple author, but since I am the only author of this personal blog, I would like to get the revision disabled.

Google is always quick way to find answers.

Quick adding line:
define(‘WP_POST_REVISIONS’, false);
To wp-config.php will by default disable the revisions support in wordpress. (tested working on current 3.x WordPress)

Lester Chan’s WordPress Plugins – How To Turn Off Post Revision In WordPress 2.6