refactor: switch to nginx for serving static files and remove Node.js dependencies

Containerfile

@@ -14,22 +14,10 @@ COPY . .
 RUN npm run build
 
 
-FROM node:22-bookworm-slim AS runtime
+FROM nginx:alpine AS runtime
 
-WORKDIR /app
+COPY --from=build /app/dist /usr/share/nginx/html
 
-ENV NODE_ENV=production
-ENV ASTRO_TELEMETRY_DISABLED=1
-ENV HOST=0.0.0.0
-ENV PORT=4321
+EXPOSE 80
 
-COPY --from=build --chown=node:node /app/package.json ./package.json
-COPY --from=build --chown=node:node /app/package-lock.json ./package-lock.json
-COPY --from=build --chown=node:node /app/node_modules ./node_modules
-COPY --from=build --chown=node:node /app/dist ./dist
-
-USER node
-
-EXPOSE 4321
-
-CMD ["node", "dist/server/entry.mjs"]
+CMD ["nginx", "-g", "daemon off;"]