feat!: remove deprecated scss mixins and variables

.nx/version-plans/version-plan-1778097455598.md

@@ -0,0 +1,6 @@
+---
+gamut-styles: major
+gamut: major
+---
+
+removes deprecated scss mixins and variables

packages/gamut-styles/README.md

@@ -2,22 +2,7 @@
 
 Base SCSS for Codecademy
 
-## Variables/
-
-This folder houses all shared SCSS style variables.
-It also contains a JavaScript file with color variables.
-
 ## Core/
 
 This folder contains a base stylesheet for the app.
 This should be imported **once** in your application.
-
-## Utils/
-
-This folder contains Sass functions (pure utilities with no stylesheet output values) and mixins (outputs CSS)
-to be used as needed both in Gamut and across the Codecademy app.
-
-The `utils.scss` and `core.scss` just import the index files from their respective folders, to make the syntax to import them from elsewhere easier, e.g.:
-
-`@use "~@codecademy/gamut-styles/utils";`
-`@use "~@codecademy/gamut-styles/core";`