Add proper div names on our ad placements

[ericholscher]

This will be deprecated here soon,
but for now this will make that data more clean.

[humitos]

I'm not sure if I have the context about this change. I guess we just want human-readable names here but don't really know how/where they are used. We may want to keep the postfix random number as it was, tho: rtd-explicit-2918.

[ericholscher]

Why do we want the random number?

[humitos]

I don't have the answer to that, but I suppose that it was added for some reason 😅, obfuscate or avoid id collisions, perhaps?

[ericholscher]

I talked with David, and these were originally done for ad blocking, but it didn't work :) So I think they are safe to remove, tho this code will be removed in a couple weeks anyway, so I'm fine if this doesn't ship.

[humitos]

OK!