Closes several issues relating to the LTS, Routing, and Isochrones maps.
Changed URL for the LTS map. Closes #4 .
Changed colour scale for LTS levels to be colourblind-friendly. New colours based on "Color Universal Design" by Okabe and Ito (2008) which claims to cover several varieties of colourblindness. Closes #5 .
Unified styling for the legend panels on each map. This looks like it was mostly already done based on the issue description, but now they should be identical. Closes #6 .
Closes several issues relating to the LTS, Routing, and Isochrones maps.