Add sepia mode
Adds sepia mode both to the editor, the preview, and the main window.
In order to support that the theming related code has been revamped, migrating some of the assets to scss, and hardcoding adwaita to prevent issues.
Adds sepia mode both to the editor, the preview, and the main window.
In order to support that the theming related code has been revamped, migrating some of the assets to scss, and hardcoding adwaita to prevent issues.