[openstreetmap/openstreetmap-website] Use bootstrap for dropdowns and tooltips (#2524)

[mmd]

I've noticed that some of the colours changed a bit, e.g. "Log In" and "Sign Up" not have a much darker background when hovered. Similar for tooltips:

Should I expect this kind of change in this PR?

![tooltip](https://user-images.githubusercontent.com/5842757/73390536-98126b80-42d6-11ea-8195-878b0be744a7.gif)





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