Add title and description metadata to documentation pages

docs/content/operations/api.md

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+---
+title: "Traefik API Documentation"
+description: "Traefik Proxy exposes information through API handlers. Learn about the security, configuration, and endpoints of APIs. Read the technical documentation."
+---
+
 # API
 
 Traefik exposes a number of information through an API handler, such as the configuration of all routers, services, middlewares, etc.

docs/content/operations/cli.md

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+---
+title: "Traefik CLI Documentation"
+description: "Learn the basics of the Traefik Proxy command line interface (CLI). Read the technical documentation."
+---
+
 # CLI
 
 The Traefik Command Line

docs/content/operations/dashboard.md

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+---
+title: "Traefik Dashboard Documentation"
+description: "The dashboard shows you the current active routes handled by Traefik Proxy in one central place. Read the technical documentation to learn its operations."
+---
+
 # The Dashboard
 
 See What's Going On

docs/content/operations/ping.md

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+---
+title: "Traefik Ping Documentation"
+description: "In Traefik Proxy, Ping lets you check the health of your Traefik instances. Read the technical documentation for configuration examples and options."
+---
+
 # Ping
 
 Checking the Health of Your Traefik Instances