[Doc] Reorganize benchmark docs (#29658)

Signed-off-by: DarkLight1337 <[email protected]>

Author: DarkLight1337

docs/.nav.yml

@@ -52,6 +52,11 @@ nav:
       - Plugins:
         - design/*plugin*.md
       - design/*
+  - Benchmarking:
+      - benchmarking/README.md
+      - benchmarking/cli.md
+      - benchmarking/sweeps.md
+      - benchmarking/dashboard.md
   - API Reference:
     - api/README.md
     - api/vllm

docs/benchmarking/README.md

@@ -0,0 +1,7 @@
+# Benchmark Suites
+
+vLLM provides comprehensive benchmarking tools for performance testing and evaluation:
+
+- **[Benchmark CLI](./cli.md)**: `vllm bench` CLI tools and specialized benchmark scripts for interactive performance testing.
+- **[Parameter Sweeps](./sweeps.md)**: Automate `vllm bench` runs for multiple configurations, useful for [optimization and tuning](../configuration/optimization.md).
+- **[Performance Dashboard](./dashboard.md)**: Automated CI that publishes benchmarks on each commit.