Add Docker deployment files

.dockerignore

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+.astro
+.git
+dist
+node_modules
+npm-debug.log*
+.DS_Store

Dockerfile

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+FROM node:24-alpine AS build
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+FROM nginx:1.29-alpine
+
+COPY --from=build /app/dist /usr/share/nginx/html
+
+EXPOSE 80