Add style on the website

Comparing the miaSim website to mia website, we see that the miaSim site is missing page style.

Might be a bug somewhere, I think it used to have a style.

To be checked and added.

We can experiment with different pkgdown styles as well, if other nice ones are available.

pkgdown manuals should tell how to add/fix style

@ake123

@ake123 could you check?

Yeah it worked locally. I'll check it

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