chore: added copyright strings and removed template page

src/pages/VisProgPage/visualProgrammingUI/components/DragDropSidebar.tsx

@@ -1,3 +1,6 @@
+// This program has been developed by students from the bachelor Computer Science at Utrecht
+// University within the Software Project course.
+// © Copyright Utrecht University (Department of Information and Computing Sciences)
 import { useDraggable } from '@neodrag/react';
 import { useReactFlow, type XYPosition } from '@xyflow/react';
 import { type ReactNode, useCallback, useRef, useState } from 'react';