Issue1632 remove images (#1645)

* Implemented PdfImageRemovalService.java and PdfImageRemovalController.java. Image can be removed testing using Postman, but the file size doesn't change.

* Fix removal logic in service file to decrease file size.

* Implement "Remove Image" feature on the website

Updated the front-end code to integrate the "Remove Image" feature. The new functionality is now fully operational on the website, allowing users to remove images as expected.

* Add comments to PdfImageRemovalController and PdfImageRemovalService.

* Change the google material icon in navbar, homepage and remove-image-pdf.html.

src/main/resources/static/css/removeImage.css

@@ -0,0 +1,22 @@
+.filename {
+    flex-grow: 1;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    margin-right: 10px;
+}
+
+.arrows {
+    flex-shrink: 0;
+    display: flex;
+    justify-content: flex-end;
+}
+.arrows .btn {
+    margin: 0 3px;
+}
+
+.move-up span,
+.move-down span {
+    font-weight: bold;
+    font-size: 1.2em;
+}