add info about reverse proxy setup with nginx

docs/self-hosting/development.md

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 ---
-sidebar_position: 4
+sidebar_position: 5
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 # Development

docs/self-hosting/reverse-proxy.md

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+---
+sidebar_position: 4
+---
+
+# Reverse Proxy Setup
+
+If you want to expose docmost to the internet, you should hide it behind a reverse proxy with SSL enabled.
+You need to enable websockets for a working setup.
+
+## Nginx
+In addition to the usual configuration for SSL, the following configuration is required for docmost to operate:
+
+```
+http {
+
+    # Adjust as required. This is the maximum size for file uploads.
+    # The default value 1M might be a little too small.
+    # This should be equal or higher than the FILE_UPLOAD_SIZE_LIMIT environment in your docker compose file
+    client_max_body_size 10M;
+
+    server {
+
+        location / {
+
+            # Adjust host and port as required.
+            proxy_pass http://localhost:3000/;
+
+            # These configuration options are required for WebSockets to work.
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection "upgrade";
+
+            proxy_redirect off;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Host $server_name;
+            add_header Referrer-Policy "strict-origin-when-cross-origin";
+        }
+    }
+}
+```
+
+## Traefik
+TBD
+
+## Caddy
+TBD
+
+## Apache2
+TBD