Refactor project structure: remove old files and reorganize ticket ordering system

- Deleted obsolete CSS files (bestellen.css, style.css) and JavaScript (script.js).
- Removed old HTML files for ticket ordering (vrijdag-kinderen.html, vrijdag-volwassenen.html, zaterdag-kinderen.html, zaterdag-volwassenen.html).
- Created new HTML files for ticket ordering under 'order-pages' directory.
- Updated ticket links in 'bestellen.html' to point to new order pages.
- Recreated database schema in a new file under 'db stuff' directory.

db stuff/database.sql

@@ -0,0 +1,56 @@
+
+CREATE DATABASE IF NOT EXISTS spik_en_span;
+USE spik_en_span;
+
+
+CREATE TABLE tickets (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    ticket_id VARCHAR(255) NOT NULL UNIQUE,
+    name VARCHAR(255) NOT NULL,
+    email VARCHAR(255) NOT NULL,
+    category ENUM('adult', 'child', 'group') NOT NULL,
+    quantity INT NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+
+CREATE TABLE employees (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    username VARCHAR(255) NOT NULL UNIQUE,
+    password_hash VARCHAR(255) NOT NULL, 
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+
+CREATE TABLE scanned_tickets (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    ticket_id VARCHAR(255) NOT NULL,
+    scanned_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    is_valid BOOLEAN NOT NULL DEFAULT TRUE,
+    UNIQUE (ticket_id)
+);
+
+
+CREATE TABLE unique_strings (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    user_id INT NOT NULL,
+    unique_code CHAR(6) NOT NULL UNIQUE,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (user_id) REFERENCES employees(id) ON DELETE CASCADE
+);
+
+
+DELIMITER $$
+CREATE TRIGGER generate_unique_code
+AFTER INSERT ON employees
+FOR EACH ROW
+BEGIN
+    DECLARE unique_code CHAR(6);
+    SET unique_code = (SELECT SUBSTRING(CONCAT(MD5(RAND()), MD5(RAND())), 1, 6));
+    INSERT INTO unique_strings (user_id, unique_code) VALUES (NEW.id, unique_code);
+END$$
+DELIMITER ;
+
+
+INSERT INTO employees (username, password_hash)
+VALUES ('admin', SHA2('password', 256));