The .subversion
directory is found in each user's home directory after executing a Subversion client once. It stores that user's configuration settings for their client, and nothing more. What you find here has absolutely no effect on server configuration.
Hook scripts must be installed into the hooks
directory of the repository itself - you need to have some level of administrative access to the server to do this.
See also http://svnbook.red-bean.com/en/1.7/svn.reposadmin.create.html#svn.reposadmin.create.hooks