refactor and move stuff

lib/entities/profile.dart

@@ -0,0 +1,20 @@
+class Profile {
+  String name;
+  String publicKey;
+  bool invisible;
+
+  Profile(this.name, this.publicKey) : invisible = false;
+
+  Profile.fromJson(Map<String, dynamic> json)
+      : name = json['name'],
+        publicKey = json['public_key'],
+        invisible = json['invisible'];
+
+  Map<String, dynamic> toJson() {
+    return {
+      'name': name,
+      'public_key': publicKey,
+      'invisible': invisible,
+    };
+  }
+}