[bisq-network/bisq-website] Use Red Hat or Fedora inspired image for the rpm download item in the dropdown (#125)

[huey735]

I blended the dark and light blue of the original logo to limit the color scheme to only two colors.
![fedora](https://user-images.githubusercontent.com/44140017/59275399-26f14b80-8c54-11e9-8a2a-5d2fbfa51c8a.png)


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