Add missing nginx docker image build

Author: dmsuehir

VisualQnA/docker/xeon/README.md

@@ -41,10 +41,12 @@ git clone https://github.com/opea-project/GenAIComps.git
 cd GenAIComps
 ```
 
-### 1. Build LVM Image
+### 1. Build LVM and NGINX Docker Image
 
 ```bash
 docker build --no-cache -t opea/lvm-tgi:latest --build-arg https_proxy=$https_proxy --build-arg http_proxy=$http_proxy -f comps/lvms/Dockerfile_tgi .
+
+docker build --no-cache -t opea/nginx:latest --build-arg https_proxy=$https_proxy --build-arg http_proxy=$http_proxy -f comps/nginx/Dockerfile .
 ```
 
 ### 2. Build MegaService Docker Image
@@ -103,7 +105,7 @@ export host_ip="External_Public_IP"
 **Append the value of the public IP address to the no_proxy list**
 
 ```
-export your_no_proxy=${your_no_proxy},"External_Public_IP"
+export your_no_proxy="${your_no_proxy},${host_ip}"
 ```
 
 ```bash