Issue #10: updating trek display to be geotrek-rando like, and adding trek start/end pois
Issue #10: adding custom icons for departure/arrival points
Issue #10: adding pictogram displays on trek
Issue #10: displaying all trek POIs, but only on specific zoom levels (>= 12)
Issue #9: adding global background url example
Issue #10: hiding leaflet layer control
Issue #10: treks are now always displayed, and zooming on trek detail