docs: remove comment header in README.md (#29273)

.rat-excludes

@@ -71,3 +71,4 @@ snowflake.svg
 # docs-related
 erd.puml
 erd.svg
+intro_header.txt

README.md

@@ -1,7 +1,3 @@
----
-hide_title: true
-sidebar_position: 1
----
 <!--
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file

docs/package.json

@@ -5,13 +5,13 @@
   "license": "Apache-2.0",
   "scripts": {
     "docusaurus": "docusaurus",
-    "_init": "cp ../README.md docs/intro.md",
+    "_init": "cat src/intro_header.txt ../README.md > docs/intro.md",
     "start": "npm run _init && docusaurus start",
     "build": "npm run _init && docusaurus build",
     "swizzle": "docusaurus swizzle",
     "deploy": "docusaurus deploy",
     "clear": "docusaurus clear",
-    "serve": "docusaurus serve",
+    "serve": "npm run _init && docusaurus serve",
     "write-translations": "docusaurus write-translations",
     "write-heading-ids": "docusaurus write-heading-ids",
     "typecheck": "tsc"

docs/src/intro_header.txt

@@ -0,0 +1,4 @@
+---
+hide_title: true
+sidebar_position: 1
+---