Add static homelab dashboard with Docker and nginx setup

Dockerfile

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+# Lightweight static host for the homelab dashboard.
+# Builds a small nginx image that serves index.html + assets.
+FROM nginx:1.27-alpine
+
+# Copy the site (static files only — no build step needed)
+COPY index.html style.css script.js /usr/share/nginx/html/
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# nginx listens on port 80
+EXPOSE 80
+
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget -q --spider http://127.0.0.1:80/ || exit 1
+
+CMD ["nginx", "-g", "daemon off;"]