Refactor button handling in index.html and app.py

src/Python/flask/web/static/script.js

@@ -0,0 +1,19 @@
+document.querySelectorAll('button').forEach(button => {
+    button.addEventListener('click', function() {
+        const direction = this.value;
+        fetch('/move', {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/x-www-form-urlencoded',
+            },
+            body: new URLSearchParams({ direction: direction }),
+        })
+        .then(response => response.json())
+        .then(data => {
+            document.getElementById('response').innerText = data.message;
+        })
+        .catch(error => {
+            document.getElementById('response').innerText = 'Er is een fout opgetreden: ' + error;
+        });
+    });
+});