Add example members.json file for web dashboard

Remove members.json from .gitignore to provide a sample configuration
that users can customize for their network member listings.

.gitignore

@@ -210,4 +210,3 @@ __marimo__/
 # MeshCore Hub specific
 *.db
 meshcore.db
-members.json

docker/members.json

@@ -0,0 +1,10 @@
+{
+  "members": [
+    {
+      "name": "Example Member",
+      "callsign": "N0CALL",
+      "role": "Network Operator",
+      "description": "Example member entry"
+    }
+  ]
+}