[bisq-network/bisq] Create new intro pop-up for v1.2 (#3426)

[Christoph Atteneder]

How about this: 
![Bildschirmfoto 2019-10-21 um 15 39 12](https://user-images.githubusercontent.com/170962/67210221-fea30600-f418-11e9-8a60-b5e241af6883.png)

I kept the cancel icon in green as we don't have action buttons right now that are black. 

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