fix: 本番環境でcookieを送れるように

[f-yusei]

実施タスク

例：issue #2

実施内容

• 例：ヘッダーの作成を行いました。
• 例：メインコンテンツの余白を調整しました。

レビューしてほしいこと

• 例：デザイン通りに表示されること
• 例：PC・SP サイズで表示崩れがないこと
• 例：リンクの確認

備考

• 例：ハンバーガーメニュー開閉時のアニメーションについては、別 PR で実装します。

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