Refactor: Update README screenshots and logo

- Reformat screenshot layout in README.md to display three images per row.
- Replace `logo (1).png` with `logo-transparent.png`.
- Update `Cover.png`.

Author: JahidHasanCO

ART/Cover.png

@@ -17,9 +17,11 @@ This project is inspired by [Diffchecker Text Compare](https://www.diffchecker.c
 
 ## Screenshots
 
-| Screenshot 1                           | Screenshot 2                           | Screenshot 3                           | Screenshot 4                           | Screenshot 5                           | Screenshot 6                           |
-|----------------------------------------|----------------------------------------|----------------------------------------|----------------------------------------|----------------------------------------|----------------------------------------|
-| ![Screenshot 1](ART/ART1-portrait.png) | ![Screenshot 2](ART/ART2-portrait.png) | ![Screenshot 3](ART/ART3-portrait.png) | ![Screenshot 4](ART/ART4-portrait.png) | ![Screenshot 5](ART/ART5-portrait.png) | ![Screenshot 6](ART/ART6-portrait.png) |
+| Screenshot 1                           | Screenshot 2                           | Screenshot 3                           |
+|----------------------------------------|----------------------------------------|----------------------------------------|
+| ![Screenshot 1](ART/ART1-portrait.png) | ![Screenshot 2](ART/ART2-portrait.png) | ![Screenshot 3](ART/ART3-portrait.png) |
+| Screenshot 4                           | Screenshot 5                           | Screenshot 6                           |
+| ![Screenshot 4](ART/ART4-portrait.png) | ![Screenshot 5](ART/ART5-portrait.png) | ![Screenshot 6](ART/ART6-portrait.png) |
 
 ## Detect Algorithm