Updated the login page with a new cool template.

Source template from https://bootsnipp.com/snippets/z8aQr.

lib/php/go.php

@@ -0,0 +1,31 @@
+<?php
+    if ( isset ( $request [ 1 ] ) ) {
+        $link_id = $request [ 1 ];
+        if ( ! ctype_digit ( $link_id ) ) {
+            die ( "You can't be forwarded to a non numerical URL link ID. If you think this is incorrect, please send an email to shorte@dev.bryanpedini.it with this URL: https://sh.bjphoster.com/?go=" . $link_id . " for more investigations" );
+        }
+        $link_id = (int) $link_id;
+        $db_connection = db_connect ( );
+        $statement = db_prepare ( $db_connection, "SELECT links.URL FROM links WHERE links.ID = ?" );
+        $parameters = [
+            [ "i" ],
+            [ &$link_id ],
+        ];
+        db_bind ( $statement, $parameters );
+        db_execute ( $statement );
+        $result = $statement->get_result ( );
+        $row = $result->fetch_assoc ( );
+        if ( ! $row ) {
+            http_response_code ( 404 );
+            include ( 'errors/404.html' );
+            exit;
+        }
+        else {
+            include ( 'templates/redirect.html' );
+            echo ( '<script>var my_location = "' . $row [ 'URL' ] . '";</script>' );
+        }
+    }
+    else {
+        header ( "Location: " . substr ( $_SERVER [ 'SCRIPT_NAME' ], 0, -10 ) );
+    }
+?>