docs: 🗑️ Deprecation information for react-old

As long as our `react-old` package is re-exporting components from `react` package it will keep getting publish with new changes, thus removing deprecation flag. Updated README and description to be clear its deprecated

packages/react-old/README.md

@@ -1,3 +1,9 @@
-# @digdir/design-system-react
+# Deprecated
+
+Replaced by `@digdir/designsystemet-react`.
+
+Read the Designsystemet [README](https://github.com/digdir/designsystemet) to get started.
+
+## @digdir/design-system-react
 
 Legacy React components of the Designsystemet

packages/react-old/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@digdir/design-system-react",
   "version": "0.53.6",
-  "description": "React components for Designsystemet",
+  "description": "Legacy React components for Designsystemet",
   "author": "Designsystemet team",
   "repository": "https://github.com/digdir/designsystemet",
   "homepage": "https://github.com/digdir/designsystemet/tree/main/packages/react-old",