chore: Add js-challenge-lab to gitignore and remove from tracking

- Added /js-challenge-lab to .gitignore to prevent future tracking
- Removed js-challenge-lab subdirectory from git tracking
- All project files are now properly located at repository root

Author: SyntaxSidekick

.gitignore

@@ -12,6 +12,9 @@ dist
 dist-ssr
 *.local
 
+# Ignore subdirectory that was moved to root
+/js-challenge-lab
+
 # Editor directories and files
 .vscode/*
 !.vscode/extensions.json