Unable to deploy React project using XAMPP - reactjs

Question

How can I build my project so I can put it wherever I want? For example, I would love to see it on, if it's possible, XAMPP?
Whenever I build my react app, index.html is empty.
Here is the whole project on GitHub: https://github.com/slabys/reacty.git
Whenever I use npm run build, my folder build is created with all the content:
index.html from build: https://pastebin.com/WSyAvrwu
package.json
{
"name": "my_react",
"version": "0.1.0",
"private": true,
"dependencies": {
"#stardust-ui/docs-components": "^0.40.0",
"#testing-library/jest-dom": "^4.2.4",
"#testing-library/react": "^9.5.0",
"#testing-library/user-event": "^7.2.1",
"bootstrap": "^4.5.0",
"browser-sync": "^2.26.7",
"del": "^5.1.0",
"express": "^4.17.1",
"express-favicon": "^2.0.1",
"gulp-autoprefixer": "^7.0.1",
"gulp-concat": "^2.6.1",
"gulp-copy": "^4.0.1",
"gulp-data": "^1.3.1",
"gulp-plumber": "^1.2.1",
"gulp-sourcemaps": "^2.6.5",
"gulp-twig": "^1.2.0",
"prettier": "^1.4.2",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"react-router": "^5.2.0",
"react-router-dom": "^5.2.0",
"react-scripts": "3.4.1",
"react-sidebar": "^3.0.2"
},
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject"
},
"eslintConfig": {
"extends": "react-app"
},
"browserslist": {
"production": [
">0.2%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
},
"description": "This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).",
"main": "index.js",
"devDependencies": {
"#craco/craco": "^5.6.4",
"#semantic-ui-react/craco-less": "^1.2.1",
"gulp": "^4.0.2",
"gulp-sass": "^4.1.0",
"node-sass": "^4.14.1",
"semantic-ui-less": "^2.4.1"
},
"author": "slabys",
"license": "ISC",
"repository": {
"type": "git",
"url": "react"
},
"optionalDependencies": {}
}

Answer 1

Problem solved!
All works fine. Just when I have this projects build in XAMPP htdocs, I put in into a folder. So after moving files from folder directly under localhost EVERYTHING started to work.