restructure: код в site/, согласно платформе Flask

site/app.py

@@ -0,0 +1,14 @@
+from flask import Flask, render_template
+
+app = Flask(__name__)
+
+@app.route("/")
+def index():
+    return render_template("index.html")
+
+@app.route("/health")
+def health():
+    return {"status": "ok"}
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=5000, debug=True)