setup maintenance container. improve pushman ui

_deploy/maintenance/default.conf

@@ -0,0 +1,11 @@
+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}

_deploy/maintenance/maintenance.yml

@@ -5,6 +5,7 @@ services:
     image: nginx:latest
     volumes:
       - /mnt/docker_volumes/maintenance:/usr/share/nginx/html
+      - /mnt/docker_volumes/maintenance/default.conf:/etc/nginx/conf.d/default.conf
     ports:
       - "3010:80"
     environment: