Move Playwright, Docker, and package.json into examples/django-react-site

Root directory now contains only the two core packages (django/, react/),
examples/, and top-level docs. All e2e/integration test infrastructure
lives in examples/django-react-site/.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

examples/django-react-site/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "mizan",
+  "version": "1.0.0",
+  "description": "Django + React server functions framework.",
+  "main": "index.js",
+  "directories": {
+    "example": "example"
+  },
+  "scripts": {},
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "devDependencies": {
+    "@playwright/test": "^1.58.2",
+    "@types/node": "^25.5.0"
+  }
+}