Restructure public/docs/ into per-language directory hierarchy

[Copilot]

Flat public/docs/{lang}-{n}.md files are reorganized into a structured directory tree with per-language index.yml metadata and per-page section splits.

New structure

public/docs/
└── cpp/
    ├── index.yml
    ├── 0-intro/
    │   ├── -intro.md          # intro text (no frontmatter)
    │   ├── 0.md               # ## C++とは？
    │   ├── 1.md               # ### 特徴
    │   └── 9-include-iostream.md
    ├── 1-types-control/
    │   └── ...
    └── ...

index.yml per language

name: C++
description: C++の基本から高度な機能までを学べるチュートリアル
pages:
  - slug: 0-intro
    name: C++の世界へようこそ
    title: C++の世界へようこそ
  - slug: 1-types-control
    name: 型システムと制御構造
    title: C++の型システムと制御構造：静的型付けとスコープを再確認する

Section files

Each h2/h3 heading becomes its own .md file with YAML frontmatter. The -intro.md file holds the text before the first section heading and has no frontmatter.

---
id: cpp-intro-0    # unique across all langs/pages/sections; index-inclusive
title: C++とは？
level: 2
---

## C++とは？
...

Scope

• 6 languages: cpp (13 pages), python (9), ruby (12), javascript (10), typescript (8), rust (12)
• 64 page directories, 64 -intro.md files, 734 section files
• All IDs unique; all YAML frontmatter valid
• No changes to app/; original {lang}-{n}.md flat files retained alongside

---

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	my-code	c987147	Commit Preview URL Branch Preview URL	Feb 22 2026, 04:06 PM