Clarify port use for nginx

README.md

@@ -18,7 +18,7 @@ go build -o tesseract-genconf ./tesseract/genconf/
 
 ```yaml
 listen:
-  - "[::]:16420"
+  - "[::]:8080"
 roots: /etc/tesseract/roots.pem
 logs:
   - shortname: example2025h1
@@ -55,7 +55,8 @@ mkdir -p /var/lib/tesseract/example2025h1/data
 ./tesseract-genconf -c config.yaml gen-nginx
 ```
 
-You can symlink the generated $monitoringprefix.conf files from `/etc/nginx/sites-enabled/`.
+The port from the main `listen:` field will be used in the NGINX server blocks (in our case
+`:8080`). You can symlink the generated $monitoringprefix.conf files from `/etc/nginx/sites-enabled/`.
 
 7. **Generate root certificates (optional):**
 ```bash