fix styles for Link sizes

Author: haschek

src/components/Link/link.scss

@@ -4,10 +4,24 @@
 .#{$prefix}--link {
     &,
     &:hover {
+        // default case: use font size from context
         font-size: 1em;
         line-height: inherit;
     }
 
+    &.#{$prefix}--link--sm {
+        font-size: $eccgui-size-typo-caption;
+        line-height: $eccgui-size-typo-caption-lineheight;
+    }
+    &.#{$prefix}--link--md {
+        font-size: $eccgui-size-typo-text;
+        line-height: $eccgui-size-typo-text-lineheight;
+    }
+    &.#{$prefix}--link--lg {
+        font-size: $eccgui-size-typo-subtitle;
+        line-height: $eccgui-size-typo-subtitle-lineheight;
+    }
+
     &:focus {
         outline: none;
         outline-offset: 0;