Refactor CSS styles for admin slideshow interface and update slide list template

- Improved formatting and consistency in the CSS file for better readability and maintainability.
- Increased the width of the slides content area from 500px to 800px in the slide list template.
- Removed obsolete image files related to the slideshow module.
- Updated the layout and styles for various elements in the slideshow admin interface.

.vscode/ftp-kr.sync.cache.json

@@ -3962,8 +3962,8 @@
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@@ -5536,8 +5536,8 @@
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@@ -6063,13 +6063,13 @@
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