feat: add new features including SEO, sitemap, and subjects management

- Create robots.txt to allow search engine indexing and specify sitemap location.
- Implement ajouterSujet.js for adding new subjects to sujets.json.
- Develop dynamic subject pages in page.tsx using static generation with metadata.
- Add contact, error, not found, and privacy policy pages for improved user experience.
- Generate sitemap.xml for better search engine visibility.
- Create SEO component for managing page metadata.
- Populate sujets.json with detailed subject information for dynamic content rendering.

README.md

@@ -1,36 +1,71 @@
-This is a [Next.js](https://nextjs.org) project bootstrapped with [`create-next-app`](https://nextjs.org/docs/app/api-reference/cli/create-next-app).
+# Learn - Site de sujets populaires
 
-## Getting Started
+Application Next.js orientee SEO qui publie des pages de contenu autour de sujets populaires.
 
-First, run the development server:
+Site en ligne: https://learn.arthurp.fr
+
+## Objectif
+
+- Publier des pages categories optimisees SEO
+- Gerer une base de sujets via un fichier JSON
+- Proposer une structure simple a maintenir et deployee facilement
+
+## Stack technique
+
+- Next.js 16 (App Router)
+- React 19
+- TypeScript
+- Tailwind CSS 4
+
+## Structure principale
+
+- src/app: pages et routes
+- src/components: composants reutilisables (SEO, etc.)
+- src/data/sujets.json: donnees de contenu
+- public/images: images statiques
+- scripts/ajouterSujet.js: script utilitaire pour ajouter un sujet
+
+## Lancer en local
+
+Prerequis:
+
+- Node.js 20+
+- npm
+
+Installation et lancement:
 
 ```bash
+npm install
 npm run dev
-# or
-yarn dev
-# or
-pnpm dev
-# or
-bun dev
 ```
 
-Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+Application disponible sur http://localhost:3000
 
-You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
+## Scripts utiles
 
-This project uses [`next/font`](https://nextjs.org/docs/app/building-your-application/optimizing/fonts) to automatically optimize and load [Geist](https://vercel.com/font), a new font family for Vercel.
+- npm run dev: demarrage en mode developpement
+- npm run build: build de production
+- npm run start: lancement de la build
+- npm run lint: verification ESLint
 
-## Learn More
+## Deploiement
 
-To learn more about Next.js, take a look at the following resources:
+Build de verification avant publication:
 
-- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
-- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+```bash
+npm run lint
+npm run build
+```
 
-You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js) - your feedback and contributions are welcome!
+Ensuite, pousser sur GitHub puis deployer sur la plateforme cible.
 
-## Deploy on Vercel
+## SEO et backlinks
 
-The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+- URL principale: https://learn.arthurp.fr
+- Ce depot documente le projet public pour renforcer le maillage vers le site principal.
 
-Check out our [Next.js deployment documentation](https://nextjs.org/docs/app/building-your-application/deploying) for more details.
+## Securite avant push
+
+- Les fichiers d'environnement (.env*) sont ignores
+- Les fichiers locaux VS Code (.vscode/) sont ignores
+- Verifier qu'aucune cle API ou secret n'est commite avant publication