Refactor the docs (#9031)

docs/developer_guide/release_process.md

@@ -0,0 +1,18 @@
+# PyPI Package Release Process
+
+## Update the version in code
+Update the package version in `python/pyproject.toml` and `python/sglang/__init__.py`.
+
+## Upload the PyPI package
+
+```
+pip install build twine
+```
+
+```
+cd python
+bash upload_pypi.sh
+```
+
+## Make a release in GitHub
+Make a new release https://github.com/sgl-project/sglang/releases/new.