chore: remove unused files

lib/models/user.dart

@@ -1,31 +0,0 @@
-import 'package:json_annotation/json_annotation.dart';
-
-/// This allows the `User` class to access private members in
-/// the generated file. The value for this is *.g.dart, where
-/// the star denotes the source file name.
-part 'user.g.dart';
-
-/// An annotation for the code generator to know that this class needs the
-/// JSON serialization logic to be generated.
-@JsonSerializable()
-class User {
-  User(this.login, this.avatarUrl, this.name, this.publicRepos, this.followers,
-      this.following);
-
-  String login;
-  String avatarUrl;
-  String name;
-  int publicRepos;
-  int followers;
-  int following;
-
-  /// A necessary factory constructor for creating a new User instance
-  /// from a map. Pass the map to the generated `_$UserFromJson()` constructor.
-  /// The constructor is named after the source class, in this case User.
-  factory User.fromJson(Map<String, dynamic> json) => _$UserFromJson(json);
-
-  /// `toJson` is the convention for a class to declare support for serialization
-  /// to JSON. The implementation simply calls the private, generated
-  /// helper method `_$UserToJson`.
-  Map<String, dynamic> toJson() => _$UserToJson(this);
-}

lib/models/user.g.dart

@@ -1,26 +0,0 @@
-// GENERATED CODE - DO NOT MODIFY BY HAND
-
-part of 'user.dart';
-
-// **************************************************************************
-// JsonSerializableGenerator
-// **************************************************************************
-
-User _$UserFromJson(Map<String, dynamic> json) {
-  return User(
-      json['login'] as String,
-      json['avatarUrl'] as String,
-      json['name'] as String,
-      json['publicRepos'] as int,
-      json['followers'] as int,
-      json['following'] as int);
-}
-
-Map<String, dynamic> _$UserToJson(User instance) => <String, dynamic>{
-      'login': instance.login,
-      'avatarUrl': instance.avatarUrl,
-      'name': instance.name,
-      'publicRepos': instance.publicRepos,
-      'followers': instance.followers,
-      'following': instance.following
-    };