[openstreetmap/openstreetmap-website] Replace var in javascript with let/const (PR #5558)

[David Tsiklauri]

@nertc approved this pull request.

All occurrences of `var` are changed with `let/const`. Checked all changed variables and `let` and `const` are set accordingly (every variable that is not changed after declaration, is `const`). Also spent some time on website to test it generally, if any page threw error in the console. Everything I checked works as expected, there are no errors.



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