fix: switch to Docker SDK with python http.server

Static SDK not serving files. Use minimal Docker with
python3 -m http.server instead.

Dockerfile

@@ -0,0 +1,5 @@
+FROM python:3.11-slim
+WORKDIR /app
+COPY index.html aether-engine.js ./
+EXPOSE 7860
+CMD ["python3", "-m", "http.server", "7860"]

README.md

@@ -3,7 +3,7 @@ title: Aether Browser
 emoji: "\u26A1"
 colorFrom: blue
 colorTo: blue
-sdk: static
-app_file: index.html
+sdk: docker
+app_port: 7860
 pinned: true
 ---