Change overflow-y value from scroll to auto in the NavLinks container (fix #7 PR)

[grzegorzpokorski]

This PR deliver more appropriate solution for issue presented in #6 issue and replace code from #7 PR. Scroll-y: auto provides, in more intelligent way, a scroll bar only when it is necessary instead of adding it in all cases.

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[robert-orlinski]

Thank you @grzegorzpokorski! As I remember (I am not sure how much "a rule" is it), most of new environments (browser + OS) hides scrollbar if not needed even if we use overflow-y: scroll but for older ones - it's awesome to have overflow-y: auto in place, as you added here 🥳