fix: create mainsail or fluidd nginx config from template

resources/klipper_webui_nginx.cfg

@@ -0,0 +1,59 @@
+# /etc/nginx/sites-available/<<UI>>
+
+server {
+    listen 80;
+    listen [::]:80;
+
+    access_log /var/log/nginx/<<UI>>-access.log;
+    error_log /var/log/nginx/<<UI>>-error.log;
+
+    #disable this section on smaller hardware like a pi zero
+    gzip on;
+    gzip_vary on;
+    gzip_proxied any;
+    gzip_proxied expired no-cache no-store private auth;
+    gzip_comp_level 4;
+    gzip_buffers 16 8k;
+    gzip_http_version 1.1;
+    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/json application/xml;
+
+    #web_path from <<UI>> static files
+    root /home/pi/<<UI>>;
+
+    index index.html;
+    server_name _;
+
+    #max upload size for gcodes (0 = no limit)
+    client_max_body_size 0;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    location = /index.html {
+        add_header Cache-Control "no-store, no-cache, must-revalidate";
+    }
+
+    location /websocket {
+        proxy_pass http://apiserver/websocket;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection $connection_upgrade;
+        proxy_set_header Host $http_host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_read_timeout 86400;
+    }
+
+    location ~ ^/(printer|api|access|machine|server)/ {
+        proxy_pass http://apiserver$request_uri;
+        proxy_set_header Host $http_host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Scheme $scheme;
+    }
+
+    location /webcam/ {
+        proxy_pass http://mjpgstreamer/;
+    }
+}