Fix slider

[hcorson-dosch-usgs]

This PR makes a minor edit to the css associated with the map slider to override a setting in the beerslider package - it was using -webkit-appearance: slider-horizontal !important;. slider-horizontal is deprecated. I updated the value by setting the css explicitly in MapImageSlider.vue:

.beer-range {
  -webkit-appearance: sliderthumb-horizontal !important;
}

I also fixed another console warning about -ms-high-contrast: by dropping a css fix for Internet Explorer in GagesBarChartAnimation.vue, since we no longer support internet explorer.

Hopefully this addresses the slider issue in Safari! 🤞🤞

[aaarcher-usgs]

Unfortunately, this is still "stuck" on the left on Safari.

[hcorson-dosch-usgs]

@aaarcher-usgs - can you test again when you get the chance? I tried a different fix

[aaarcher-usgs]

unfortunately, it's still not working. I ran npm install again, too, just in case that helped