chore(core-styles): update local build steps

These steps were based on Core-Styles in its own repo, where it had tags from which `git describe` could produce a build ID.

No tags in new repo, so simpler default build step, and do not mention `git describe`.

libs/core-styles/README.md

@@ -168,17 +168,17 @@ If you changes files in a `src/lib/` directory, you may need to follow some of t
 
 You can build stylesheets **from** source files **in** `src/lib` directory **to** compiled files **in** `dist` directory.
 
-0. (Optional) Set version (for preserved comment):
+1. Build stylesheets:
 
-   ```bash
-   npm run version -- --build-id="$(git describe --always)"
-   ```
+    ```bash
+    npm run build
+    ```
 
-1. Build stylesheets:
+    **or**, for custom build id:
 
-   ```bash
-   npm run build
-   ```
+    ```bash
+    npm run build -- --build-id="..."
+    ```
 
 ## Testing