package: pin webpack version for vuepress (#6238)

docs/package.json

@@ -28,6 +28,7 @@
     "postcss": "8",
     "sass": "1.42.1",
     "vuepress": "1.9.10",
+    "webpack": "4.0.0",
     "whatwg-fetch": "3.6.20"
   },
   "scripts": {

package.json

@@ -9,7 +9,7 @@
     "docs": "pnpm --filter @grapesjs/docs docs",
     "docs:api": "pnpm --filter @grapesjs/docs docs:api",
     "lint": "eslint .",
-    "build": "pnpm --filter \"!@grapesjs/docs\" build",
+    "build": "pnpm -r run build",
     "ts:check": "pnpm --filter grapesjs ts:check",
     "clean": "find . -type d \\( -name \"node_modules\" -o -name \"build\" -o -name \"dist\" \\) -exec rm -rf {} + && rm ./pnpm-lock.yaml",
     "format": "prettier . --write --ignore-path .prettierignore",