[bisq-network/bisq] Add "Buy BSQ" button next to trade fee selector (#5055)

[Christoph Atteneder]

Now with more context. Clicking on `Learn More` opens the popup, clicking on `Buy BSQ` brings you to the Buy BSQ offer book.
![Bildschirmfoto 2021-10-06 um 12 13 35](https://user-images.githubusercontent.com/170962/136184208-95d73d64-9645-4ab9-8c05-4a5866082b02.png)
![Bildschirmfoto 2021-10-06 um 12 13 40](https://user-images.githubusercontent.com/170962/136184219-96b9efe1-92fc-4437-9667-cbd1570bfa43.png)
![Bildschirmfoto 2021-10-06 um 12 14 08](https://user-images.githubusercontent.com/170962/136184223-8e2451ab-85f3-4d14-b400-221dc6e28a5e.png)


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