There is no built in way to do this, however what you could do is this, after making sure you are on the latest release and things are working properly:
Make a full backup in case of issues, and turn your site offline while you do this
Delete all files and folders apart from
/applications/
/api/.htaccess (if you have one)
/datastore/
/plugins/
/uploads/
constants.php (if you have one)
conf_global.php
.htaccess
Upload a fresh set of files from your client area
Note, this is something done at your own risk, and does not account for any changes you may have made from default, such as upload location changes, third party items etc