chore(duplicate): Removed duplicate roundDecimal scss function.

Author: Jen Downs

src/scss/_functions.scss

@@ -120,37 +120,6 @@ map-get($breakpoint, margin) != 0) {
   }
 }
 
-// _decimal.scss | MIT License | gist.github.com/terkel/4373420
-@function roundDecimal ($number, $digits: 0, $mode: round) {
-  $n: 1;
-  // $number must be a number
-  @if type-of($number) != number {
-    @warn '#{ $number } is not a number.';
-    @return $number;
-  }
-  // $digits must be a unitless number
-  @if type-of($digits) != number {
-    @warn '#{ $digits } is not a number.';
-    @return $number;
-  } @else if not unitless($digits) {
-    @warn '#{ $digits } has a unit.';
-    @return $number;
-  }
-  @for $i from 1 through $digits {
-    $n: $n * 10;
-  }
-  @if $mode == round {
-    @return round($number * $n) / $n;
-  } @else if $mode == ceil {
-    @return ceil($number * $n) / $n;
-  } @else if $mode == floor {
-    @return floor($number * $n) / $n;
-  } @else {
-    @warn '#{ $mode } is undefined keyword.';
-    @return $number;
-  }
-}
-
 /// String to number converter
 /// @author Hugo Giraudel
 @function stringToNumber($value) {