Fix navbar-menu in mobile without JavaScript

The problem is that Bulma doesn't offer the same basic functionality
without JavaScript. Namely, if you don't have JavaScript enabled,
you cannot access the navbar menu nor toggle the navigation menu
in mobile or low-resolution devices. However, it's possible to offer
this features without JavaScritp.

Unlike the JavaScript version, the version without JavaScript doesn't
have an animation when you toggle the navigation menu.
It's impossible to change the value of the attribute aria-expanded
(which should change to true when the menu is shown), so it must be
removed.
Furthermore, maybe it's not enough to use the pseudoelement :hover

Obviously, the ones who disable JavaScript will have less features,
but the website will be usable.

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