chore: move cross-env to devDependencies

package.json

@@ -3,6 +3,7 @@
     "version": "0.0.1",
     "private": true,
     "devDependencies": {
+        "cross-env": "^7.0.3",
         "@tailwindcss/ui": "^0.1.3",
         "cssnano": "^4.1.10",
         "del": "^6.0.0",
@@ -42,7 +43,6 @@
     },
     "dependencies": {
         "codemirror": "^5.58.1",
-        "cross-env": "^7.0.3",
         "diff": "^4.0.2",
         "dropbox": "^5.2.0",
         "ignore": "^5.1.8",