🐛(richie) nginx container should listen to configured port

Nginx container for Richie's application was configured to open the 80
port while it was listening to "richie_nginx_port". There is no big deal
as the port is opened when the container is deployed, but this is more
consistent.

apps/richie/templates/nginx/dc.yml.j2

@@ -36,7 +36,7 @@ spec:
         - image: "{{ richie_nginx_image_name }}:{{ richie_nginx_image_tag }}"
           name: nginx
           ports:
-            - containerPort: 80
+            - containerPort: {{ richie_nginx_port }}
               protocol: TCP
           volumeMounts:
             - mountPath: /etc/nginx/conf.d