Split file loading into two separate buttons

- Add 'Load an Object' button for standard JSON files (.json)
- Add 'Load a Log File' button for JSON Lines files (.log)
- Each button has specific file type filter and handling logic
- Improved user experience with clear separation of functionality
- Add styling for the new info button (log files)
- Update documentation to reflect the two-button approach

src/index.css

@@ -65,6 +65,12 @@ code {
   color: white;
 }
 
+.btn-outline-info:hover {
+  background-color: #17a2b8;
+  border-color: #17a2b8;
+  color: white;
+}
+
 .header-section {
   background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
   color: white;