Rename About and fix links (#4571) (#4572)

(cherry picked from commit 74049d0)

Co-authored-by: Clayton Cornell <[email protected]>

docs/sources/_index.md

@@ -15,11 +15,11 @@ Grafana Agent is based around **components**. Components are wired together to
 form programmable observability **pipelines** for telemetry collection,
 processing, and delivery.
 
-> **NOTE**: This page focuses mainly on "[Flow mode][]," the
-> Terraform-inspired variant of Grafana Agent.
->
-> For information on other variants of Grafana Agent, refer to [About Grafana
-> Agent][].
+{{% admonition type="note" %}}
+This page focuses mainly on [Flow mode]({{< relref "./flow/" >}}), the Terraform-inspired variant of Grafana Agent.
+
+For information on other variants of Grafana Agent, refer to [Introduction to Grafana Agent]({{< relref "./about.md" >}}).
+{{% /admonition %}}
 
 Grafana Agent can collect, transform, and send data to:
 
@@ -28,8 +28,6 @@ Grafana Agent can collect, transform, and send data to:
 * The Grafana open source ecosystem ([Loki][], [Grafana][], [Tempo][], [Mimir][], [Phlare][])
 
 [Terraform]: https://terraform.io
-[Flow mode]: {{< relref "./flow/" >}}
-[About Grafana Agent]: {{< relref "./about.md" >}}
 [Prometheus]: https://prometheus.io
 [OpenTelemetry]: https://opentelemetry.io
 [Loki]: https://github.com/grafana/loki

docs/sources/about.md

@@ -2,11 +2,12 @@
 aliases:
 - ./about-agent/
 canonical: https://grafana.com/docs/agent/latest/about/
-title: About Grafana Agent
+title: Introduction to Grafana Agent
+menuTitle: Introduction
 weight: 100
 ---
 
-# About Grafana Agent
+# Introduction to Grafana Agent
 
 Grafana Agent is a vendor-neutral, batteries-included telemetry collector. It
 is designed to be flexible, performant, and compatible with multiple ecosystems