Ajout documentation projets OpenClassrooms (P02-P13) avec support bilingue

- Add all project documentation pages in French and English
- Include PDF viewers for presentations and documents (P10, P12)
- Add collapsible sections for scripts and logs (P10)
- Add static assets for all projects
- Update sidebars with new projets-openclassrooms category
- Add npm start:en script for testing English locale

i18n/en/docusaurus-plugin-content-docs/current/projets-openclassrooms/p04-architecture-ntiers.md

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+---
+sidebar_position: 4
+---
+
+# P4 - Docker N-tier Architecture
+
+## Context
+
+Deployment of a containerized n-tier architecture for BeeSafe company, including a web server, database and DNS server.
+
+## Objectives
+
+- Containerize a LAMP web application
+- Configure a DNS server with Bind9
+- Set up a reverse proxy
+- Document the technical architecture
+
+## Technologies Used
+
+- **Docker / Docker Compose**: containerization
+- **Apache/PHP**: web server
+- **MySQL**: database
+- **Bind9**: DNS server
+
+## Deployed Architecture
+
+```
+                    +-------------+
+                    |   Client    |
+                    +------+------+
+                           |
+                    +------v------+
+                    |  DNS Bind9  |
+                    +------+------+
+                           |
+                    +------v------+
+                    |   Apache    |
+                    |    + PHP    |
+                    +------+------+
+                           |
+                    +------v------+
+                    |    MySQL    |
+                    +-------------+
+```
+
+## Deliverables
+
+<details>
+<summary>Architecture Diagram (PDF)</summary>
+
+<iframe src="/assets/projets-oc/p04/schema_archi_ntiers.pdf" width="100%" height="600px" style={{border: 'none'}}></iframe>
+
+</details>
+
+<details>
+<summary>Docker Compose</summary>
+
+```yaml
+services:
+  web:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: apache_php
+    ports:
+      - "80:80"
+    volumes:
+      - ./web:/var/www/html
+      - ./apache/beesafe.conf:/etc/apache2/sites-available/beesafe.conf
+    depends_on:
+      - db
+      - dns
+    networks:
+      - backend
+    restart: unless-stopped
+
+  db:
+    image: mysql:8.0
+    container_name: mysql
+    environment:
+      MYSQL_ROOT_PASSWORD: rootclassroom
+      MYSQL_DATABASE: beesafe_db
+    volumes:
+      - db_data:/var/lib/mysql
+      - ./sql:/docker-entrypoint-initdb.d
+    networks:
+      - backend
+    restart: unless-stopped
+
+  dns:
+    image: internetsystemsconsortium/bind9:9.18
+    container_name: bind9
+    ports:
+      - "53:53/tcp"
+      - "53:53/udp"
+    volumes:
+      - ./bind9/etc:/etc/bind
+      - ./bind9/cache:/var/cache/bind
+      - ./bind9/lib:/var/lib/bind
+      - ./bind9/log:/var/log
+    command: ["-g"]
+    networks:
+      - backend
+    restart: unless-stopped
+
+networks:
+  backend:
+    driver: bridge
+
+volumes:
+  db_data:
+```
+
+</details>
+
+<details>
+<summary>Dockerfile</summary>
+
+```dockerfile
+FROM php:8.0-apache
+
+# Update and install dependencies
+RUN apt-get update && apt-get install -y \
+    libzip-dev \
+    unzip \
+    && docker-php-ext-install mysqli \
+    && docker-php-ext-enable mysqli
+
+# Enable beesafe.conf site and disable default 000-default.conf site
+RUN a2ensite beesafe.conf && \
+    a2dissite 000-default.conf && \
+    service apache2 reload
+
+# Clean unnecessary files to reduce image size
+RUN apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# Command to keep Apache running
+CMD ["apache2-foreground"]
+```
+
+</details>
+
+## Skills Acquired
+
+- Multi-tier application containerization
+- DNS server configuration
+- Orchestration with Docker Compose
+- Decoupled application architecture