Add Dockerfile and docker-compose for production deployment

Multi-stage build: hugomods/hugo:exts → nginx:alpine.
Runs on port 8080.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.dockerignore

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+public/
+resources/
+.hugo_build.lock
+.idea/

Dockerfile

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+FROM hugomods/hugo:exts AS builder
+WORKDIR /src
+COPY . .
+RUN git submodule update --init --recursive && \
+    hugo --gc --minify
+
+FROM nginx:alpine
+COPY --from=builder /src/public /usr/share/nginx/html
+EXPOSE 80

docker-compose.yml

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+services:
+  web:
+    build: .
+    ports:
+      - "8080:80"
+    restart: unless-stopped