[docs] Visited links in Header/Footer are not visible in IE6

[Hirokazu Yamamoto]

  Hello.

As subject says, visited links in header/footer in index.html are not 
visible in IE6 (Windows).
Screenshot attached.

I believe priority is very low, because IE6 is legacy browser.

I confirmed this can be workarounded by removing

a:visited {
     color: #355f7c;
     text-decoration: none;
}

from _static/default.css.

And I'm not sure this is correct or not.

Thank you.
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