fix: change pink-bluegrey theme to pink-lightgreen

[beeman]

This goes with this PR: angular/material.angular.io/pull/570

Fixing angular/material.angular.io/issues/222

[jelbourn]

Removing the existing theme would be a breaking change without any real benefit. We can just add new prebuilt themes, though. I personally think the pink and green combination is a bit garish; how about a more muted primary color with a bright accent color?

[beeman]

@jelbourn did not consider this would be a breaking change but you're right.

We could add another theme but that won't address the original issue where the accent color of pink-bluegrey is not very clear.

It's related to these values here where in dark mode the color hue 200 of the palette is used.

In case of the blue-grey palette that results in a very small difference.

Not sure if we want to address it after all, but if so we might want to pick a darker hue of the default accent palette.

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