不具合修正 / クイックタグ追加

【修正内容】
■固定ページLPテンプレートのヘッダー内「背景画像(モバイルサイズ時)」が反映されない不具合の修正
■スマホ用固定フッターバーの表示アニメーションをフェードに変更
■クイックタグに「番号付きリスト」を追加
■citeタグを含むblockquoteのスタイルを調整
■PHP8.0環境のユーザー編集画面のDeprecatedエラー対策修正

【修正したファイル】
admin/inc/seo.php
css/design-plus.css
css/footer-bar.css
css/responsive.css
functions/custom_editor.php
functions/head.php
functions/user-profile.php
languages/ja.mo
languages/ja.po
page-lp.php
style.css

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