Use publisher-house ads for EthicalAds.io

- These ads are never exhausted. There will always be an ad.
- We can directly control what is shown or what is cycled between
  in all markets.
- We can cycle in real advertisers without affecting any metrics.

ethicalads-theme/templates/ea/includes/ad-placement.html

@@ -1 +1 @@
-<div data-ea-publisher="ethicaladsio" data-ea-type="image" data-ea-campaign-types="house"></div>
+<div data-ea-publisher="ethicaladsio" data-ea-type="image" data-ea-campaign-types="publisher-house"></div>