Services: Use 16_9 image for opengraph.

src/templates/services.pug

@@ -8,7 +8,7 @@ include mixins/components
 
 | {% set page_title = 'Services' %}
 | {% set page_description = 'On Blender Cloud you can create and share personal projects, access our texture and HDRI library (or create your own), keep track of your production, manage your renders and much more!' %}
-| {% set page_header_image = url_for('static', filename='assets/img/backgrounds/background_services.jpg', _external=true) %}
+| {% set page_header_image = url_for('static', filename='assets/img/backgrounds/background_services_16_9.jpg', _external=true) %}
 
 | {% block page_title %}{{ page_title }}{% endblock %}