[bisq-network/bisq-website] Fix and optimize image alt tags for better SEO (#321)

[Steve Jain]

@RiccardoMasutti there was still a mistake. Testing in your local browser would easily help find these kinds of issues.

![Screenshot from 2020-01-27 16-16-31](https://user-images.githubusercontent.com/735155/73214781-bfd4c880-414a-11ea-86a3-f86e0778ad09.png)

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