chore: set preview to false

Author: HerringtonDarkholme

package.json

@@ -20,7 +20,7 @@
     "extension"
   ],
   "publisher": "ast-grep",
-  "preview": true,
+  "preview": false,
   "displayName": "ast-grep VSCode: Structural Search, Replace and more",
   "homepage": "https://ast-grep.github.io",
   "repository": "https://github.com/ast-grep/ast-grep-vscode",