Sendgrid integration.

[adhorrig]

Form contents needed to be mailed to info@coderdojo.org

Additionally, there is a mail icon in the footer which does nada. When clicked it should open a mail form. Could add the mail modal to modal.twig and use an if to display the correct one (page-foundation.twig also uses the modal). Something like:

{% include 'modal.twig' with { 'purpose': 'contact' } %}

cc @rossoneill