UI: Grayscaled maps for readability

[TomCools]

In a few of the quickstarts maps are rendered. The readability of the calculated routes on these maps could be improved by making them grayscale.

Context

Example:

With Grayscale:

Solution

Since it is rendered by Leaflet, the following will make the maps grayscale. Either make them grayscale by default or introduce a toggle.

.leaflet-tile-pane {
    -webkit-filter: grayscale(100%);
    filter: grayscale(100%);
    opacity: 0.5;
}