style(docs): top menu position: fixed on external resources page (#5337)
style(docs): top menu position: fixed on external resources page (#5337)

Top menu had position: absolute what was leading to its disappearing on scrolling

(#5336)

Co-authored-by: George Looshch <40b25eac438260c9ad4e3142adc38a8d0885e5f3@Georges-MacBook-Air.local>
martinsik/rxjs,ReactiveX/rxjs,ReactiveX/rxjs,ReactiveX/RxJS,martinsik/rxjs,benlesh/RxJS,benlesh/RxJS,ReactiveX/rxjs,kwonoj/RxJS,benlesh/RxJS,ReactiveX/RxJS,kwonoj/RxJS,kwonoj/RxJS,kwonoj/RxJS,ReactiveX/RxJS,ReactiveX/rxjs,martinsik/rxjs,benlesh/RxJS,ReactiveX/RxJS,martinsik/rxjs