How to redirect your whole website using 301 redirect within the .htaccess file
In your Document root open the .htaccess file if present otherwise create a .htaccess file
Once the file is open edit the contents of the file and add the following code to it
Redirect 301 / http://yoursite.com/
Replace the url with your url where you want your website to be redirected to.
Upload the .htaccess file and test, the redirection should work