Add title and description metadata to documentation pages

docs/content/observability/metrics/datadog.md

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+---
+title: "Traefik Datadog Metrics Documentation"
+description: "Traefik Proxy supports Datadog for backend metrics. Read the technical documentation to enable Datadog for observability."
+---
+
 # Datadog
 
 To enable the Datadog:

docs/content/observability/metrics/influxdb.md

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+---
+title: "Traefik InfluxDB Documentation"
+description: "Traefik supports several metrics backends, including InfluxDB. Learn how to implement it for observability in Traefik Proxy. Read the technical documentation."
+---
+
 # InfluxDB
 
 To enable the InfluxDB:

docs/content/observability/metrics/overview.md

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+---
+title: "Traefik Metrics Overview"
+description: "Traefik Proxy supports four metrics backend systems: Datadog, InfluxDB, Prometheus, and StatsD. Read the full documentation to get started."
+---
+
 # Metrics
 
 Traefik supports 4 metrics backends:

docs/content/observability/metrics/prometheus.md

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+---
+title: "Traefik Prometheus Documentation"
+description: "Traefik supports several metrics backends, including Prometheus. Learn how to implement it for observability in Traefik Proxy. Read the technical documentation."
+---
+
 # Prometheus
 
 To enable the Prometheus:

docs/content/observability/metrics/statsd.md

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+---
+title: "Traefik StatsD Documentation"
+description: "Traefik supports several metrics backends, including StatsD. Learn how to implement it for observability in Traefik Proxy. Read the technical documentation."
+---
+
 # StatsD
 
 To enable the Statsd: