Add a default nginx config to use for our published image

docker/Viewer-v2.x/default.conf

@@ -0,0 +1,12 @@
+server {
+  listen 80;
+  location / {
+    root   /usr/share/nginx/html;
+    index  index.html index.htm;
+    try_files $uri $uri/ /index.html;
+  }
+  error_page   500 502 503 504  /50x.html;
+  location = /50x.html {
+    root   /usr/share/nginx/html;
+  }
+}