Add Dockerfile and docker-compose for production deployment

Multi-stage build: Node 20 builds the React app, nginx serves the static files on port 3000.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DReRqHxSYuVfCzTzQGD9hZ

Dockerfile

@@ -0,0 +1,11 @@
+FROM node:20-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+FROM nginx:alpine
+COPY --from=build /app/build /usr/share/nginx/html
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

docker-compose.yml

@@ -0,0 +1,5 @@
+services:
+  prayer:
+    build: .
+    ports:
+      - "3000:80"