Fixed the code to make it work

.gitignore

-.vscode*
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+.vscode*
+public/config/config.php
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.htaccess

+RewriteEngine On
+RewriteCond %{REQUEST_FILENAME}.php -f
+RewriteRule ^([/.*]+)(/.*)?$ $1.php$2 [NC,L] 
+#RewriteRule ^(.*)/([0-9a-zA-Z]+)/([0-9a-zA-Z]+)$ $1?$2=$3 [L,QSA,NC]
+
+RewriteCond %{REQUEST_URI} !^public/
+RewriteRule ^(.*)$ public/$1 [L,R=301]
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README.md

 # MySchoolDay
 
-A school roster project for yh4f
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+A school roster project for yh4f
+
+# Usage:
+
+## Setup
+
+For apache2 make sure to have the directory block like this:
+```
+<Directory /var/www/>
+        Options Indexes FollowSymLinks
+        AllowOverride All
+        Require all granted
+</Directory>
+```

myschoolday.sql

+-- phpMyAdmin SQL Dump
+-- version 4.6.6deb5
+-- https://www.phpmyadmin.net/
+--
+-- Host: localhost:3306
+-- Gegenereerd op: 13 nov 2021 om 17:14
+-- Serverversie: 10.3.29-MariaDB-0+deb10u1
+-- PHP-versie: 7.3.29-1~deb10u1
+
+--
+-- Database: `myschoolday`
+--
+CREATE DATABASE IF NOT EXISTS `myschoolday` DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
+USE `myschoolday`;
+
+-- --------------------------------------------------------
+
+--
+-- Tabelstructuur voor tabel `users`
+--
+
+DROP TABLE IF EXISTS `users`;
+CREATE TABLE `users` (
+  `id` int(11) NOT NULL,
+  `firstname` varchar(100) NOT NULL,
+  `lastname` varchar(100) NOT NULL,
+  `email` varchar(1000) NOT NULL,
+  `school_id` int(11) NOT NULL,
+  `password` varchar(1000) NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+--
+-- Indexen voor geëxporteerde tabellen
+--
+
+--
+-- Indexen voor tabel `users`
+--
+ALTER TABLE `users`
+  ADD PRIMARY KEY (`id`);

public/config/config.template.php

+<?php
+$config = [];
+$config['dbhost'] = '';
+$config['dbuser'] = '';
+$config['dbpass'] = '';
+$config['dbname'] = '';
+return $config;
+?>
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public/functions/class.php

 <?php
-include 'database.php';
+include_once 'database.php';
 class MySchoolDay {
     public $config = [];
     public $db = null;
 
     private function __construct() {
-        $config = include_once 'config.php';
-    }
-
-    public function setup(){
+        $this->config = include '../config/config.php';
         $this->db = new db($this->config['dbhost'], $this->config['dbuser'], $this->config['dbpass'], $this->config['dbname']);
     }
 };

public/functions/config.php

-<?php
-$config = [];
-$config['dbhost'] = 'localhost';
-$config['dbuser'] = 'myschoolday';
-$config['dbpass'] = 'mYseCurePassWOrd';
-$config['dbname'] = 'myschoolday';
-return $config;
-?>
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public/header.php

@@ -10,12 +10,12 @@ $app = new MySchoolDay();
         <meta name="twitter:card" content="summary_large_image">
         <meta name="twitter:title" content="<?php echo $page_title; ?> - MySchoolDay">
         <meta name="twitter:description" content="MySchoolDay WebApp">
-        <meta name="twitter:image" content="/images/logo.png">
+        <meta name="twitter:image" content="images/logo.png">
         <meta property="og:url" content="">
         <meta property="og:type" content="website">
         <meta property="og:title" content="<?php echo $page_title; ?> - MySchoolDay">
         <meta property="og:description" content="MySchoolDay WebApp">
-        <meta property="og:image" content="/images/logo.png">
+        <meta property="og:image" content="images/logo.png">
         <meta property="twitter:domain" content="myschoolday.org">
         <meta property="twitter:url" content="">
         <link rel="shortcut icon" type="image/ico" href="favicon.ico"/>