[openstreetmap-website] Make it more obvious that markers on routing feature are draggable (#920)

[kerosin]

> Good design of draggable elements should have at least some sort of visual cue of what can be dragged (and what can't), at least something to set it apart from other (undraggable) elements on the page

quoted from "HTML5 Unleashed" by Simon Sarris

suggestions:
- change cursor to grab or similiar for routing markers 
- when mouseover at marker: show a small tooltip that says something like "drag this marker to set a start point"

read a few comments that it wasn't clear to some users that those markers are draggable.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/920
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