mess with includes

certain headers are included in fs_reader.h
fs namespace defined in fs_reader.h

src/fs_reader.cpp

@@ -1,8 +1,5 @@
-#include <string>
-#include <vector>
 #include <iostream>
-#include <filesystem>
-namespace fs = std::filesystem;
+#include "fs_reader.h"
 
 // from the provided path, find all files and folders
 // This is done by finding all the files and folders in the starting dir