rename config.json to config.json.sample and ignore config.json in git repository

.gitignore

@@ -0,0 +1 @@
+assets/config.json

assets/config.json.sample

@@ -1,11 +1,11 @@
 {
-  "jitsiLauncher": "meet.bnvb.eu",
-  "jitsiHost": "meet.bnvb-ingenieure.de",
-  "nextcloudBase": "https://cloud.bnvb-ingenieure.de",
+  "jitsiLauncher": "server.domain.tld/subdir",
+  "jitsiHost": "jit.si",
+  "nextcloudBase": "https://cloud.domain.tld",
   "allowAdhocMeetings": true,
   "launchTimeout": 2000,
-  "backgroundImage": "assets/images/background.png",
-  "logo": "assets/images/logo.svg",
+  "backgroundImage": "path/to/backgroundimage",
+  "logo": "path/to/logo",
   "downloads": {
     "windows": "https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet.exe",
     "macos": "https://github.com/jitsi/jitsi-meet-electron/releases/latest/download/jitsi-meet.dmg",