improve Caddy config docs

TLS with Caddy does not require providing the cert and key files. Also, the removal of `Server` header does not add any security nor is it being does for other servers.

Author: mohammed90

docs/Getting-Started/Reverse-Proxy.md

@@ -13,12 +13,10 @@ http://romm.mysite.com {
 ### Caddy + TLS (HTTPS)
 
 ```caddyfile
-https://romm.mysite.com {
-  tls mysite.com.crt mysite.com.key  # Certificate and key files
-
+romm.mysite.com {
   encode zstd gzip
 
-  header * {
+  header {
     Strict-Transport-Security "max-age=31536000;"
     X-XSS-Protection "1; mode=block"
     X-Frame-Options "SAMEORIGIN"