try to better highlight donations and sponsorships options ...

... and to better explain why they are required.

Please don't say "someone else will help the project, I'll just use it"

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

sftpgo.json

@@ -333,7 +333,8 @@
     "setup": {
       "installation_code": "",
       "installation_code_hint": "Installation code"
-    }
+    },
+    "hide_support_link": false
   },
   "telemetry": {
     "bind_port": 0,