Make frontend nginx conf suitable for k8s or local deployment (no need for 'old' deployment bits)

frontend/nginx/nginx.conf

@@ -10,19 +10,25 @@ events {
 }
 
 http {
-    include       /etc/nginx/mime.types;
     default_type  application/octet-stream;
+    include       /etc/nginx/mime.types;
 
     log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                       '$status $body_bytes_sent "$http_referer" '
                       '"$http_user_agent" "$http_x_forwarded_for"';
 
     access_log  /var/log/nginx/access.log  main;
-
     sendfile        on;
     #tcp_nopush     on;
-
     keepalive_timeout  65;
     gzip  on;
     include /etc/nginx/conf.d/*.conf;
+
+    server {
+        root /usr/share/nginx/html;
+        index index.html;
+        listen 8000;
+        listen [::]:8000;
+        server_name telemetry.polkadot.io localhost;
+    }
 }