fix: Added missing title metadata

New files didn't have YAML metadata, it is added now.

docs/01-getting-started/01-choosing-a-deployment-method.md

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+---
+title: Choosing a Method
+---
+
 # Choosing a Deployment or Development Method
 
 This repository (`frappe_docker`) supports **multiple ways to run Frappe using Docker**.

docs/01-getting-started/02-docker-immutability.md

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+---
+title: Docker Immutability
+---
+
 # Important Concept: Immutability and Persistence
 
 A frequent source of confusion is how **Docker-based Frappe deployments handle persistence**.

docs/02-setup/08-single-server-nginxproxy-example.md

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+---
+title: Single Server Example
+---
+
 # Single Server Example (nginx-proxy + acme-companion)
 
 This guide demonstrates a single-server setup using nginx-proxy and acme-companion for HTTPS. It is best for a small number of hostnames and a single bench. If you need multiple benches or advanced routing, use the Traefik-based example instead.

docs/03-production/04-nginx-proxy-acme-companion.md

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+---
+title: NGINX and ACME Companion
+---
+
 # nginx-proxy + acme-companion (HTTPS)
 
 This guide explains how to use nginx-proxy with acme-companion to provide HTTPS for a Frappe Docker stack.

docs/03-production/05-caddy-https.md

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+---
+title: Caddy with HTTPS
+---
+
 # Caddy reverse proxy (local HTTPS)
 
 This guide shows how to use Caddy as an external reverse proxy in front of the frontend container. It is most useful for local HTTPS or internal networks.

docs/06-migration/02-traefik-v3-migration.md

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+---
+title: Migrate Traefik from v2 to v3
+---
+
 # Migrate an existing Traefik v2 instance to v3
 
 Use this guide if you already run Traefik v2 with `frappe_docker` and want to upgrade to v3. It focuses on the image upgrade and the v3 routing rule changes that affect existing setups.