fix(title): remove previous title css

MIGRATION.md

@@ -1,10 +1,18 @@
 <h1>Migration Guide</h1>
 
+- [From version 2.2.0 to 2.3.0](#from-version-220-to-230)
 - [From version 2.0.x to 2.1.0](#from-version-20x-to-210)
 - [From version 1.x to 2.0.x](#from-version-1x-to-20x)
   - [Date Input](#date-input)
   - [All](#package-react-toolkit-all)
 
+# From version 2.2.0 to 2.3.0
+
+## Title
+
+The Title component used to have some different css based on a specific `classModifier` or `className`. For `classModifier` it was called `bigTitle` and for `className` it was `af-subtitle`. This two custom css have now been deleted for the component. If you are using them on your project, you should remove them and make this implementation yourself.
+The Title component only implement what our UXs have designed.
+
 # From version 2.0.x to 2.1.0
 
 ## Toolkit-core

packages/title/src/title.scss

@@ -38,11 +38,6 @@ h4.af-title::after {
     margin-top: 0;
   }
 
-  &--bigTitle {
-    font-size: 4.25rem;
-    font-weight: 600;
-  }
-
   &--content {
     color: $color-mine-shaft;
     border-bottom: 1px solid $color-silver;
@@ -56,24 +51,3 @@ h4.af-title::after {
     }
   }
 }
-
-.af-subtitle {
-  color: $color-mine-shaft;
-  position: relative;
-  overflow: hidden;
-  width: 100%;
-  font-weight: 600;
-
-  &::after {
-    content: '';
-    position: absolute;
-    height: 2px;
-    width: 100%;
-    z-index: 1;
-    margin-left: 2rem;
-    top: 50%;
-    transform: (-50%, 0);
-    background: $color-dusty-gray;
-    opacity: 0.3;
-  }
-}