chore(project): remove sassdoc commands (#7710)

* chore(project): remove sassdoc commands

* chore(project): update README docs links

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

Author: joshblack

packages/colors/README.md

@@ -137,12 +137,6 @@ blue[50]; // Using the `blue` object.
 warmGray100; // Using the `warmGray100` variable.
 ```
 
-## 📖 API Documentation
-
-If you're looking for `@carbon/colors` API documentation, check out:
-
-- [Sass](./docs/sass.md)
-
 ## 📚 Examples
 
 If you're looking for more examples on how to use `@carbon/colors`, we have some