Add WP Engine

WP Engine is a popular hosting platform for WordPress sites of all sizes.

- https://wpengine.com
- https://github.com/wpengine
- https://developer.amd.com
- https://studentloanhero.com
- https://www.hydroxycut.com
- https://bambooclothing.co.uk
- https://www.sendcloud.com
- https://www.healthloop.com
- https://clipchamp.com
- https://nzdigital.co.nz
- https://cmaawards.com

WP Engine adds a unique header called “wpe-backed” that we can use for fingerprinting.