feat: add output standalone and .dockerignore

Author: BatuhanW

refine-nextjs/template/.dockerignore

@@ -0,0 +1,7 @@
+**/node_modules/
+**/dist
+.git
+npm-debug.log
+.coverage
+.coverage.*
+.env

refine-nextjs/template/next.config.mjs

@@ -3,6 +3,7 @@ const nextConfig = {
     <%_ if (answers["ui-framework"] === 'antd') { _%>
         transpilePackages: ['@refinedev/antd'],
     <%_ } _%>
+    output: "standalone"
 };
 
 export default nextConfig;