move const CONFIG to json file and add documentation in README.md

assets/config.json

@@ -0,0 +1,15 @@
+{
+  "jitsiLauncher": "meet.bnvb.eu",
+  "jitsiHost": "meet.bnvb-ingenieure.de",
+  "nextcloudBase": "https://cloud.bnvb-ingenieure.de",
+  "launchTimeout": 2000,
+  "backgroundImage": "assets/images/background.png",
+  "logo": "assets/images/logo.svg",
+  "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",
+    "linux": "https://github.com/jitsi/jitsi-meet-electron/releases",
+    "ios": "https://apps.apple.com/app/jitsi-meet/id1165103905",
+    "android": "https://play.google.com/store/apps/details?id=org.jitsi.meet"
+  }
+}