Revert "Header Font Updates"

This reverts commit 6859285.

Author: kkartunov

src/styles/_mixins/typography.scss

@@ -126,44 +126,36 @@
 @mixin tc-heading-xl {
   @include roboto-light;
 
-  color: $tc-black;
-  font-size: 42px;
-  line-height: 50px;
-}
-
-@mixin tc-heading-lg {
-  @include roboto-light;
-
   color: $tc-black;
   font-size: 36px;
   line-height: 45px;
 }
 
-@mixin tc-heading-md {
+@mixin tc-heading-lg {
   @include roboto-regular;
 
   color: $tc-black;
   font-size: 28px;
   line-height: 35px;
 }
 
-@mixin tc-heading-sm {
+@mixin tc-heading-md {
   @include roboto-regular;
 
   color: $tc-black;
   font-size: 20px;
-  line-height: 35px;
+  line-height: 30px;
 }
 
-@mixin tc-heading-xs {
+@mixin tc-heading-sm {
   @include roboto-bold;
 
   color: $tc-black;
   font-size: 15px;
   line-height: 25px;
 }
 
-@mixin tc-heading-xxs {
+@mixin tc-heading-xs {
   @include roboto-bold;
 
   color: $tc-black;