Update to version 1.3

- Added `resources.c` and `resources.h` to the `.gitignore` file.
- Modified the `execute_command` function to use `g_spawn_command_line_async` for asynchronous command execution.
- Updated the `show_confirmation_dialog` function to display a GTK dialog with a warning icon and improved layout.
- Added a margin to the buttons in the `create_button` function for better spacing.
- Improved error handling for loading the window icon in the `activate` function.
- Updated README.md with more information about manually compiling ssdd

.gitignore

@@ -1 +1,3 @@
 ssdd
+resources.c
+resources.h