Add Vietnamese ISO 14001 training site with 13 modules

[laswy]

Motivation

• Provide a self-contained Vietnamese training curriculum for ISO 14001:2015 targeted at manufacturing sites with emphasis on identifying and escalating serious nonconformities.
• Make training content modular and practical by including lecture material, real-world scenarios, common failure cases, quick practice exercises, and mandatory nonconformance alerts per module.

Description

• Added a landing page training/index.html with responsive layout, styles, sidebar navigation, and links to module pages.
• Added 13 module files under training/modules/ (m1_tong_quan_iso14001.html through m13_doi_ung_co_quan_ben_lien_quan.html) each containing lecture content, scenario, failure cases, quick-practice, and a major nonconformance alert.
• Standardized module structure and copy to reinforce evidence-based assessment and the requirement to escalate when objective evidence is missing or nonconformities recur.
• Included accessible markup and small responsive CSS rules to support mobile and desktop viewing.

Testing

• No automated tests were run for these changes.

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Codex Task

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[chatgpt-codex-connector]

Publish modules as complete HTML documents

Clicking any Mở mô-đun link in training/index.html navigates to files like this one that contain only a <section> fragment, not a full HTML page. Since all layout/styles and metadata are defined in the landing page document, each module opens without the intended responsive styling and without its own document metadata (including charset), which can degrade or break module rendering when served independently. Either wrap each module in a full HTML shell or load these fragments into index.html instead of linking to them directly.

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