feat(theme): improvements and refactoring of theme module

fix: theme rebase

src/theme/style/mod.rs

@@ -0,0 +1,22 @@
+// Copyright 2022 System76 <info@system76.com>
+// SPDX-License-Identifier: MPL-2.0
+
+//! Stylesheet implements for [`crate::Theme`]
+
+mod button;
+pub use self::button::Button;
+
+pub mod iced;
+pub use iced::Application;
+pub use iced::Checkbox;
+pub use iced::Container;
+pub use iced::ProgressBar;
+pub use iced::Rule;
+pub use iced::Svg;
+pub use iced::Text;
+
+mod segmented_button;
+pub use self::segmented_button::SegmentedButton;
+
+mod text_input;
+pub use self::text_input::TextInput;