Create Admin page to manage the mailing list

[MarshallAsch]

Edit this may be changed to use a mailing list platform like mailjet or mailgun

This ticket is for an admin page at /admin/subscribers on this page an admin should be able to view a paged list of all the subscribers. It should list their email, if the email has been verified and have a delete button to remove them from the list. It should have an add button to manually add someone to the list.

This page should make the following AJAX requests to do actions on the page

GET /api/v1/subscribers?offset=0&limit=20 to get the pages
DELETE /api/v1/subscribers/:subscriberId to remove them from the list
POST /api/v1/subscribers to manually add someone to the list.

Note that when manually adding someone to the list it will override the email verification stage.
The post request will take a JSON object something like:

{
    "email": "email@example.com"
}