tools: avoid pending deprecation in doc generator

`unist-util-find` depends on `lodash.iteratee` which uses
`process.binding()`.
Let's remove this dependency which is used in one place to do a very
simple thing.

PR-URL: #37267
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

tools/doc/html.js

@@ -24,7 +24,6 @@
 const common = require('./common.js');
 const fs = require('fs');
 const unified = require('unified');
-const find = require('unist-util-find');
 const visit = require('unist-util-visit');
 const markdown = require('remark-parse');
 const gfm = require('remark-gfm');
@@ -97,7 +96,13 @@ function toHTML({ input, content, filename, nodeVersion, versions }) {
 // Set the section name based on the first header.  Default to 'Index'.
 function firstHeader() {
   return (tree, file) => {
-    const heading = find(tree, { type: 'heading' });
+    let heading;
+    visit(tree, (node) => {
+      if (node.type === 'heading') {
+        heading = node;
+        return false;
+      }
+    });
 
     if (heading && heading.children.length) {
       const recursiveTextContent = (node) =>

tools/doc/package.json

@@ -17,7 +17,6 @@
     "remark-rehype": "8.0.0",
     "to-vfile": "6.1.0",
     "unified": "9.2.0",
-    "unist-util-find": "^1.0.2",
     "unist-util-select": "3.0.4",
     "unist-util-visit": "2.0.3"
   },