Add Docker, NGINX config, and CI workflow

Introduces Dockerfile and nginx.conf for containerized deployment of the Angular frontend. Adds a GitHub Actions workflow for automated Docker image build and push. Updates README with setup, tech stack, and deployment instructions.

Dockerfile

@@ -0,0 +1,12 @@
+# Build
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npm run build -- --configuration production
+
+# Serve
+FROM nginx:stable-alpine
+COPY --from=build /app/dist/*/browser /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf