Update index.php
Update index.php

- Fixed vulnerability - logged in admin could delete files from any directory (added realpath).
- Added SRI hashes to external JavaScript and CSS files: jquery.min.js, bootstrap.min.js, autosize.min.js, taboverride.min.js, jquery.taboverride.min.js, bootstrap.min.css).
- Removed uneccessarry session unset.
- Minor text changes.
robiso/wondercms