Alternative second ad placement for revshare partners

[davidfischer]

Adds a second possible ad placement for revenue share partners only. Still only a single placement will be selected, but this change offers a second possible placement in the footer with a larger placement. The server will decide which placement to choose based on inventory.

Branched from #695

[ericholscher]

This looks simple enough. Needs the merge from the prior change in the other PR.

We should also ensure the projects know this is coming before we ship it.

[davidfischer]

We should also ensure the projects know this is coming before we ship it.

I spoke with the pallets team directly. The other main revshare partner is Celery.

[ericholscher]

Should we follow up w/ Celery on the payout email thread perhaps?

[ericholscher]

I'm good to merge this as well if we want -- I don't think Celery cares too much.

[davidfischer]

I'll try to get the merge conflict fixed today, but I'd love a review from @humitos.

[humitos]

I tried this locally but I wasn't able to make it work. I'm not sure how to make the new ad placement to appear. How do I reproduce this behavior locally?

By the way, do you have an screenshot on how it looks on our theme and Alabaster themes?

[davidfischer]

I tried this locally but I wasn't able to make it work. I'm not sure how to make the new ad placement to appear. How do I reproduce this behavior locally?

Since the devserver requests a paid ad and there's no large format paid ads, it's not showing. I'll see if I can setup a better example.

Edit: I added a second placement in the public/index.html.