docs(readme): add Roman Urdu edition (#6499)

* docs(readme): add Roman Urdu edition

Register ur-Latn with a pending website catalog and preserve English command examples.

Script-tag handling follows morluto's shared helper proposed in PR #2043 (c46f606c89).

* test(website): cover completed script-tag page metadata

docs/readme/README_es.md

@@ -1,7 +1,7 @@
 <div align="center">
 
 [English](../../README.md) · [简体中文](README_zh.md) · [繁體中文](README_zh-TW.md) · [日本語](README_ja.md) · [한국어](README_ko.md) · [Türkçe](README_tr.md) · [Русский](README_ru.md) · [Tiếng Việt](README_vi.md) · [ไทย](README_th.md) · [Deutsch](README_de.md) · **Español** · [Français](README_fr.md) · [Українська](README_uk.md) · [Polski](README_pl.md) · [Português (Brasil)](README_pt-BR.md) · [العربية](README_ar.md) · [فارسی](README_fa.md) · [Bahasa Indonesia](README_id.md) · [Italiano](README_it.md)
-· [Ελληνικά](README_el.md) · [മലയാളം](README_ml.md)
+· [Ελληνικά](README_el.md) · [മലയാളം](README_ml.md) · [Roman Urdu](README_ur-Latn.md)
 
 # REA: Ingeniería inversa de cualquier cosa