Add title and description metadata to documentation pages

docs/content/contributing/advocating.md

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+---
+title: "Traefik Advocation Documentation"
+description: "There are many ways to contribute to Traefik Proxy. If you're talking about Traefik, let us know and we'll promote your enthusiasm!"
+---
+
 # Advocating
 
 Spread the Love & Tell Us about It

docs/content/contributing/building-testing.md

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+---
+title: "Traefik Building & Testing Documentation"
+description: "Compile and test your own Traefik Proxy! Learn how to build your own Traefik binary from the sources, and read the technical documentation."
+---
+
 # Building and Testing
 
 Compile and Test Your Own Traefik!

docs/content/contributing/data-collection.md

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+---
+title: "Traefik Data Collection Documentation"
+description: "To learn more about how Traefik is being used and improve it, we collect anonymous usage statistics from running instances. Read the technical documentation."
+---
+
 # Data Collection
 
 Understanding How Traefik is Being Used

docs/content/contributing/documentation.md

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+---
+title: "Traefik Contribution Documentation"
+description: "Found something unclear in the Traefik Proxy documentation and want to give a try at explaining it better? Read the guide to building documentation."
+---
+
 # Documentation
 
 Features Are Better When You Know How to Use Them

docs/content/contributing/maintainers-guidelines.md

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+---
+title: "Traefik Maintainer's Guidelines Documentation"
+description: "Interested in contributing more to the community and becoming a Traefik Proxy maintainer? Read the guide to becoming a part of the core team."
+---
+
 # Maintainer's Guidelines
 
 ![Maintainer's Guidelines](../assets/img/maintainers-guidelines.png)

docs/content/contributing/maintainers.md

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+---
+title: "Traefik Maintainers Documentation"
+description: "Traefik Proxy is an open source software with a thriving community of contributors and maintainers. Read the list of maintainers on this page."
+---
+
 # Maintainers
 
 ## The Team

docs/content/contributing/submitting-issues.md

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+---
+title: "Traefik Submitting Issues Documentation"
+description: "Help us help you! Learn how to submit an issue, following the guidelines, so the Traefik Proxy team can help. Read the technical documentation."
+---
+
 # Submitting Issues
 
 Help Us Help You!

docs/content/contributing/submitting-pull-requests.md

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+---
+title: "Traefik Pull Requests Documentation"
+description: "Looking to contribute to Traefik Proxy? This guide will show you the guidelines for submitting a PR in our contributors guide repository."
+---
+
 # Submitting Pull Requests
 
 A Quick Guide for Efficient Contributions

docs/content/contributing/submitting-security-issues.md

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+---
+title: "Traefik Security Documentation"
+description: "Security is a key part of Traefik Proxy. Read the technical documentation to learn about security advisories, CVE, and how to report a vulnerability."
+---
+
 # Security
 
 ## Security Advisories

docs/content/contributing/thank-you.md

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+---
+title: "Traefik Contribution Documentation"
+description: "Thank you to all those who have contributed! Traefik Proxy is an open-source project that thrives with the support of our passionate community."
+---
+
 # Thank You!
 
 _You_ Made It