Update ci workflows (#1804)

docs/README.md

@@ -0,0 +1,33 @@
+# SGLang Documentation
+
+## Build the documentation website
+
+### Dependency
+```
+pip install -r requirements.txt
+```
+
+### Build
+```
+make html
+```
+
+### Clean
+To remove all generated files:
+```
+make clean
+```
+
+### Serve (preview)
+Run an HTTP server and visit http://localhost:8000 in your browser.
+```
+python3 -m http.server --d _build/html
+```
+
+### Deploy
+Clone [sgl-project.github.io](https://github.com/sgl-project/sgl-project.github.io) and make sure you have write access.
+
+```bash
+export DOC_SITE_PATH=../../sgl-project.github.io   # update this with your path
+python3 deploy.py
+```