chore: update styling guide (#5437)

* chore: add styling guide
* chore: remove spectrum-config and update other docs
* fix: update yarn new-package to not depend on spectrum-css
* chore: update styling guide
* chore: remove formating from plopfile

Author: TarunAdobe

projects/documentation/content/guides/generating-components.md

@@ -22,8 +22,6 @@ _Note_ that your component name should be provided in kebab case and should rela
     - [new-component-name]
         - src
             - index.ts
-            - spectrum-[new-component-name].css
-            - [new-component-name]-overrides.css
             - [new-component-name].css
             - [NewComponentName].ts
         - stories