[bisq-network/bisq-website] improve css (#402)

[m52go]

@Ankit9915 hello, thanks for the PR. Can you please detail what this pull request aims to achieve?

>From what I'm seeing, a lighter `font-weight` makes text harder to read.

Before on left, after on right:

![Screenshot from 2020-10-05 23-30-50](https://user-images.githubusercontent.com/735155/95155830-88f88d00-0784-11eb-8c26-ba1ffbd95f2c.png)

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