Fix deprecated functions in sass files

src/scss/_config.scss

@@ -1,4 +1,5 @@
-@import 'tokens';
+@use 'tokens';
+@use 'sass:map';
 
 /**
  * SIZE SCALE
@@ -6,14 +7,14 @@
  * it is relevant for (font-size, margin, padding). All items are
  * calcuated off these tokens.
  */
-$size-scale: map-get($tokens, 'size-scale');
+$size-scale: map.get(tokens.$tokens, 'size-scale');
 
 /**
  * COLORS
  * Colors are shared between backgrounds and text by default. 
  * You can also use them to power borders, fills or shadows, for example.
  */
-$colors: map-get($tokens, 'colors');
+$colors: map.get(tokens.$tokens, 'colors');
 
 /**
  * METRICS