updating Dockerfile to pull in custom default.conf to overload default file.

docker/backstage.conf

@@ -1,9 +0,0 @@
-server {
-   listen 80 default_server;
-   root /usr/share/backstage/html;
-   server_name backstage.local;
-   index index.html index.htm;
-   location / {
-       try_files $uri /index.html;
-   }
-}

docker/default.conf

@@ -0,0 +1,23 @@
+server {
+    listen       80;
+    server_name  localhost;
+
+    #charset koi8-r;
+    #access_log  /var/log/nginx/host.access.log  main;
+
+    location / {
+        root   /usr/share/nginx/html;
+        index  index.html index.htm;
+        try_files $uri /index.html;
+    }
+
+    #error_page  404              /404.html;
+
+    # redirect server error pages to the static page /50x.html
+    #
+    error_page   500 502 503 504  /50x.html;
+    location = /50x.html {
+        root   /usr/share/nginx/html;
+    }
+}
+