Add opentelemetry.io docs

website_docs/_index.md

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+---
+title: "Collector"
+linkTitle: "Collector"
+weight: 10
+description: >
+  <img width="35" src="https://raw.github.com/open-telemetry/opentelemetry.io/main/iconography/32x32/Collector.svg"></img>
+  Vendor-agnostic way to receive, process and export telemetry data
+---
+
+<img src="https://raw.github.com/open-telemetry/opentelemetry.io/main/iconography/Otel_Collector.svg"></img>
+
+The OpenTelemetry Collector offers a vendor-agnostic implementation on how to
+receive, process and export telemetry data. It removes the need to run,
+operate, and maintain multiple agents/collectors in order to support
+open-source observability data formats (e.g. Jaeger, Prometheus, Fluent Bit,
+etc.) sending to one or more open-source or commercial back-ends. The Collector
+is the default location instrumentation libraries export their telemetry data.
+
+Objectives:
+
+- Usable: Reasonable default configuration, supports popular protocols, runs and collects out of the box.
+- Performant: Highly stable and performant under varying loads and configurations.
+- Observable: An exemplar of an observable service.
+- Extensible: Customizable without touching the core code.
+- Unified: Single codebase, deployable as an agent or collector with support for traces, metrics, and logs (future).