Visually clarify that links are clickable

[stefano-ottolenghi]

(complements #292).

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[recrwplay]

To also revert the hover behavior for the Get Started button in the banner, remove cursor: default; from the rule on line 75 of src/css/themes.css.

body.docs .banner .button a:hover {
...
}

I don't think there are any other css rules we need to update.

[recrwplay]

Preview looks good - thanks