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/quickstart.md

@@ -1,81 +1,22 @@
 ---
-summary: "Install OpenClaw, onboard the Gateway, and pair your first channel."
+summary: "Quick start has moved to Getting Started."
 read_when:
-  - You want the fastest path from install to a working Gateway
+  - You are looking for the fastest setup steps
+  - You were sent here from an older link
 title: "Quick start"
 ---
 
-<Note>
-OpenClaw requires Node 22 or newer.
-</Note>
-
-## Install
-
-<Tabs>
-  <Tab title="npm">
-    ```bash
-    npm install -g openclaw@latest
-    ```
-  </Tab>
-  <Tab title="pnpm">
-    ```bash
-    pnpm add -g openclaw@latest
-    ```
-  </Tab>
-</Tabs>
-
-## Onboard and run the Gateway
-
-<Steps>
-  <Step title="Onboard and install the service">
-    ```bash
-    openclaw onboard --install-daemon
-    ```
-  </Step>
-  <Step title="Pair WhatsApp">
-    ```bash
-    openclaw channels login
-    ```
-  </Step>
-  <Step title="Start the Gateway">
-    ```bash
-    openclaw gateway --port 18789
-    ```
-  </Step>
-</Steps>
-
-After onboarding, the Gateway runs via the user service. You can still run it manually with `openclaw gateway`.
+# Quick start
 
 <Info>
-Switching between npm and git installs later is easy. Install the other flavor and run
-`openclaw doctor` to update the gateway service entrypoint.
+Quick start is now part of [Getting Started](/start/getting-started).
 </Info>
 
-## From source (development)
-
-```bash
-git clone https://github.com/openclaw/openclaw.git
-cd openclaw
-pnpm install
-pnpm ui:build # auto-installs UI deps on first run
-pnpm build
-openclaw onboard --install-daemon
-```
-
-If you do not have a global install yet, run onboarding via `pnpm openclaw ...` from the repo.
-
-## Multi instance quickstart (optional)
-
-```bash
-OPENCLAW_CONFIG_PATH=~/.openclaw/a.json \
-OPENCLAW_STATE_DIR=~/.openclaw-a \
-openclaw gateway --port 19001
-```
-
-## Send a test message
-
-Requires a running Gateway.
-
-```bash
-openclaw message send --target +15555550123 --message "Hello from OpenClaw"
-```
+<Columns>
+  <Card title="Getting Started" href="/start/getting-started">
+    Install OpenClaw and run your first chat in minutes.
+  </Card>
+  <Card title="Onboarding Wizard" href="/start/wizard">
+    Full CLI wizard reference and advanced options.
+  </Card>
+</Columns>