Add title and description metadata to documentation pages

docs/content/reference/static-configuration/cli.md

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+---
+title: "Traefik CLI Flags Documentation"
+description: "Reference the CLI flags for static configuration in Traefik Proxy. Read the technical documentation."
+---
+
 # Static Configuration: CLI
 
 --8<-- "content/reference/static-configuration/cli-ref.md"

docs/content/reference/static-configuration/env.md

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+---
+title: "Traefik Environment Variables Documentation"
+description: "Reference the environment variables for static configuration in Traefik Proxy. Read the technical documentation."
+---
+
 # Static Configuration: Environment variables
 
 --8<-- "content/reference/static-configuration/env-ref.md"

docs/content/reference/static-configuration/file.md

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+---
+title: "Traefik File Static Configuration"
+description: "Reference the YAML and TOML files for static configuration in Traefik Proxy. Read the technical documentation."
+---
+
 # Static Configuration: File
 
 ```yml  tab="YAML"

docs/content/reference/static-configuration/overview.md

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+---
+title: "Traefik Static Configuration Overview"
+description: "Read the official Traefik documentation to get started with static configuration in Traefik Proxy."
+---
+
 # Static Configuration
 
 - [File](./file.md)