feat: added docker compose and nginx config files

docker-compose.yml

+version: '3.6'
+services:
+  web:
+    image: nginx:latest
+    container_name: flight-booking-app
+    ports:
+      - "8081:80"
+    volumes:
+      - ./dist/flight-agency-app:/usr/share/nginx/html
+      - ./nginx.conf:/etc/nginx/conf.d/default.conf
+    networks:
+      - my-angular-network
+
+networks:
+  my-angular-network:
+

nginx.conf

+server {
+    listen 80;
+    server_name localhost;
+
+    location / {
+        root /usr/share/nginx/html;
+        index index.html;
+        try_files $uri $uri/ /index.html =404;
+    }
+}