Add new views and styles for music application

- Created new CSS files for styling the application, including home.css and style.css.
- Implemented 403 and 404 error views with appropriate messages and navigation.
- Developed a dump view to display deleted elements with restoration options.
- Enhanced home view to include music search functionality and display results.
- Added listplay view for managing music playlists, including creation and deletion options.
- Implemented loadmusic view for uploading new music with necessary fields.
- Created login and register views for user authentication.
- Developed sound view to display individual music tracks with playback controls and options for liking and deleting.
- Updated menu view to include navigation links based on user authentication status.

etc/functions.php

@@ -0,0 +1,12 @@
+<?php
+
+function getElementsDelete(array $elements){
+    $data = [];
+    foreach($elements as $element){
+        foreach($element as $value){
+            array_push($data, $value);
+        }
+    }
+    krsort($data);
+    return $data;
+}