package.json: use local cross-env (#249)

Author: chalin

package.json

@@ -13,7 +13,7 @@
     "_check:links": "echo IMPLEMENTATION PENDING for check-links; echo",
     "_hugo": "hugo --cleanDestinationDir",
     "_hugo-dev": "npm run _hugo -- -e dev -DFE",
-    "_local": "cross-env HUGO_MODULE_WORKSPACE=docsy.work",
+    "_local": "npx cross-env HUGO_MODULE_WORKSPACE=docsy.work",
     "_serve": "npm run _hugo-dev -- --minify serve",
     "build:preview": "npm run _hugo-dev -- --minify --baseURL \"${DEPLOY_PRIME_URL:-/}\"",
     "build:production": "npm run _hugo -- --minify",
@@ -34,6 +34,7 @@
   },
   "devDependencies": {
     "autoprefixer": "^10.4.14",
+    "cross-env": "^7.0.3",
     "hugo-extended": "0.120.4",
     "postcss-cli": "^10.1.0"
   }