moved type definitions to a separate directory and fixed some documentations under utils/

utils/types/galleryEntry.ts

@@ -0,0 +1,18 @@
+/**
+ * Type for gallery image entry data
+ * @module utils/galleryEntry
+ */
+
+/**
+ * Interface for gallery image entry
+ * @property {number} id id from database
+ * @property {string} imagePath image URL
+ * @property {string} caption caption of the image
+ */
+interface GalleryEntry {
+    id: number;
+    imagePath: string;
+    caption: string;
+}
+
+export type { GalleryEntry };