- Replaced `gpt_markdown` with `flutter_markdown_plus` in `pubspec.yaml`.
- Updated `pubspec.lock` to reflect the new dependency version.
- Modified `markdown_config.dart` to generalize styling configuration.
- Updated `streaming_markdown_widget.dart` to utilize `MarkdownBody` for rendering markdown content.
- Replaced `flutter_highlight` with `gpt_markdown` in `pubspec.yaml`.
- Updated `pubspec.lock` to reflect new dependencies and removed obsolete ones.
- Deleted outdated Riverpod migration documentation files to streamline the project.
- Added new configurations for GptMarkdown styling in `markdown_config.dart` and updated the streaming markdown widget implementation.
