utility function to get value of a key in a deep map

deepmap.scss

/// Get value from a deep map
/// @group utility
/// @param {map} $map - source map to pull key from
/// @param {string...} $keys - key to extract value of
/// @return key value
@function map-deep-get($map, $keys...) {
  @each $key in $keys {
    $map: map-get($map, $key);
  }
  @return $map;
}