Incubator Notice - combines multiple emails into a single string

When `page.email` has multiple addreses like `email: ["user1@institution.edu", "user2@institution.edu"]` the following generates an invalid email address.

{% if site.pilot %}
The lesson taught in this workshop is being piloted and a precise schedule is yet to be established. The workshop will include regular breaks. Please contact the workshop organisers if you would like more information about the planned schedule.
{% endif %}

`contact the workshop organisers`