chore(generateSearch): dont use deprecated functions

Author: hasezoey

scripts/generateSearch.js

@@ -86,7 +86,7 @@ for (const [filename, file] of Object.entries(docsFilemap.fileMap)) {
     });
   } else if (file.guide) {
     let text = fs.readFileSync(filename, 'utf8');
-    text = text.substr(text.indexOf('block content') + 'block content\n'.length);
+    text = text.substring(text.indexOf('block content') + 'block content\n'.length);
     text = pug.render(`div\n${text}`, { filters: { markdown }, filename });
 
     const content = new Content({