Docs: streamline start and install docs (#9648)

* docs(start): streamline getting started flow

* docs(nav): reorganize start and install sections

* docs(style): move custom css to style.css

* docs(navigation): align zh-CN ordering

* docs(navigation): localize zh-Hans labels

docs/start/setup.md

@@ -1,5 +1,5 @@
 ---
-summary: "Setup guide: keep your OpenClaw setup tailored while staying up-to-date"
+summary: "Advanced setup and development workflows for OpenClaw"
 read_when:
   - Setting up a new machine
   - You want “latest + greatest” without breaking your personal setup
@@ -8,6 +8,11 @@ title: "Setup"
 
 # Setup
 
+<Note>
+If you are setting up for the first time, start with [Getting Started](/start/getting-started).
+For wizard details, see [Onboarding Wizard](/start/wizard).
+</Note>
+
 Last updated: 2026-01-01
 
 ## TL;DR
@@ -43,6 +48,14 @@ openclaw setup
 
 If you don’t have a global install yet, run it via `pnpm openclaw setup`.
 
+## Run the Gateway from this repo
+
+After `pnpm build`, you can run the packaged CLI directly:
+
+```bash
+node openclaw.mjs gateway --port 18789 --verbose
+```
+
 ## Stable workflow (macOS app first)
 
 1. Install + launch **OpenClaw.app** (menu bar).