Removed ftxui from github pushing and added it to gitignore

main.cpp

@@ -1,13 +0,0 @@
-#include "content.hpp"
-#include <ftxui/component/screen_interactive.hpp>
-#include <ftxui/dom/elements.hpp>
-#include <ftxui/dom/node.hpp>
-#include <ftxui/screen/screen.hpp>
-#include <iostream>
-
-int main() {
-  ftxui::ScreenInteractive screen = ftxui::ScreenInteractive::Fullscreen();
-  ftxui::Component app = std::make_shared<PortfolioApp>();
-  screen.Loop(app);
-  return 0;
-}