update netlify deploy script

Author: yyx990803

netlify.toml

@@ -9,3 +9,11 @@
 [[redirects]]
   from = "/guide/writing-guide.html"
   to = "/guide/contributing/writing-guide.html"
+
+[build.environment]
+  NODE_VERSION = "16"
+  NPM_FLAGS = "--version" # prevent Netlify npm install
+
+[build]
+  publish = "src/.vitepress/dist"
+  command = "npx pnpm i --store=node_modules/.pnpm-store && npm run build"