feat: add release script to package.json for automated versioning and publishing

Author: onmax

package.json

@@ -12,6 +12,7 @@
     "dev": "pnpm run dev:packages && pnpm run --filter=./docs dev",
     "dev:packages": "pnpm --filter=./packages/{nimiq-css,nimiq-vitepress-theme} --parallel run dev",
     "lint": "eslint --cache .",
+    "release": "bumpp -r && pnpm -r publish",
     "test": "vitest",
     "lint:fix": "eslint --cache --fix ."
   },