fix broken links

README.md

@@ -161,7 +161,7 @@ Win: %UserProfile%\.kube\config
 #### 安装 Ingress
 
 ```shell
-kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/mandatory.yaml
+kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml
 kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/provider/cloud-generic.yaml
 ```
 
@@ -204,7 +204,7 @@ kubectl delete -f sample/ingress.yaml
 
 ```shell
 kubectl delete -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/provider/cloud-generic.yaml
-kubectl delete -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/mandatory.yaml
+kubectl delete -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml
 ```
 
 ### 安装 Helm