Add Google DoubleClick other domain to trackers Progress towards #141.
|# DoubleClick by Google (2mdn.net)|
|> Brief description of the tracker – [Source](link)|
|> “2mdn.net is a domain owned by Google that is used for loading ad content for DoubleClick from the Google CDN.” – [Source](https://en.wiki-domains.net/wiki/2mdn.net)|
|## Ethical design violations|
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