Add title and description metadata to documentation pages

docs/content/getting-started/concepts.md

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+---
+title: "Traefik Concepts Documentation"
+description: "Get started with Traefik Proxy. Read the technical documentation for an introduction into the key concepts behind our open source edge router."
+---
+
 # Concepts
 
 Everything You Need to Know

docs/content/getting-started/configuration-overview.md

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+---
+title: "Traefik Configuration Documentation"
+description: "Get started with Traefik Proxy. This page will introduce you to the dynamic routing and startup configurations. Read the technical documentation."
+---
+
 # Configuration Introduction
 
 How the Magic Happens

docs/content/getting-started/faq.md

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+---
+title: "Traefik Getting Started FAQ"
+description: "Check out our FAQ page for answers to commonly asked questions on getting started with Traefik Proxy. Read the technical documentation."
+---
+
 # FAQ
 
 ## Why is Traefik Answering `XXX` HTTP Response Status Code?

docs/content/getting-started/install-traefik.md

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+---
+title: "Traefik Installation Documentation"
+description: "There are several flavors to choose from when installing Traefik Proxy. Get started with Traefik Proxy, and read the technical documentation."
+---
+
 # Install Traefik
 
 You can install Traefik with the following flavors:

docs/content/getting-started/quick-start.md

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+---
+title: "Traefik Getting Started Quickly"
+description: "Looking to get started with Traefik Proxy quickly? Read the technical documentation to learn a simple use case that leverages Docker."
+---
+
 # Quick Start
 
 A Simple Use Case Using Docker