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/nikamebel.svg

@@ -31,4 +31,4 @@
                 style="fill-rule:nonzero;" />
             <rect x="11219.5" y="155.38" width="170.664" height="1362.62" style="fill-rule:nonzero;" />
         </g>
-</svg>
+</svg>