Remove @hotwired/turbo integration and Turbo loader demo (#2735)

core/scss/tabler-vendors.scss

@@ -12,5 +12,4 @@
 @forward 'vendor/stars-rating';
 @forward 'vendor/coloris';
 @forward 'vendor/typed';
-@forward 'vendor/turbo';
 @forward 'vendor/fullcalendar';

core/scss/vendor/_turbo.scss

@@ -1,5 +0,0 @@
-@use '../config' as *;
-
-.turbo-progress-bar {
-  background: var(--#{$prefix}primary);
-}