Refactor JSON data structure and add new logo for Shkafnik

- Cleaned up formatting in flags.json for better readability by removing unnecessary newlines.
- Added new logo entry for "Shkafnik" in logos.json with associated properties and color sets.
- Created a new SVG file for "Shkafnik" logo with detailed path definitions.
- Ensured proper formatting in existing SVG files by adding missing newlines at the end of files.

public/images/logos/ntfy.svg

@@ -26,4 +26,4 @@
             <stop offset="1" style="stop-color:#56bda8;stop-opacity:1" />
         </linearGradient>
     </defs>
-</svg>
+</svg>