Add contribution page and Docker deployment

Dockerfile

@@ -0,0 +1,24 @@
+# syntax=docker/dockerfile:1
+
+FROM node:22-alpine AS deps
+WORKDIR /app
+RUN corepack enable && corepack prepare pnpm@10.33.2 --activate
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+
+FROM node:22-alpine AS build
+WORKDIR /app
+RUN corepack enable && corepack prepare pnpm@10.33.2 --activate
+ARG VITE_PLIMI_REPO_URL=https://github.com/your-org/plimi
+ENV VITE_PLIMI_REPO_URL=$VITE_PLIMI_REPO_URL
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN pnpm build
+
+FROM nginx:1.27-alpine AS runtime
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /app/dist /usr/share/nginx/html
+EXPOSE 80
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget -qO- http://127.0.0.1/ >/dev/null || exit 1
+CMD ["nginx", "-g", "daemon off;"]