Adjust opacities so that layers are always visible

[timhitchins]

Currently when a user hovers over features, it is hard to see when both the state and nation are the same color and on at the same time. Some time will need to be taken to experiment with regular and hover state opacities.

[timhitchins]

After testing the opacities a bit more, it seems there are two options:

1. Decrease the opacity of all layers. This is the opacity set to 0.7. It was 0.95 before. All layers are on here:
   

2. Turn off the nations layer:
   

cc @bretthalperin

[brett-halperin]

Hey thanks for posting this! I am thinking option 1 because I do not want to turn off the nations layer. But it is hard to tell what it will look like overall at 0.7. Do you think it will look not that different overall or do any other conflicts arise? I know this is a minor detail, so no huge urgency here but maybe we can adjust this at some point.