feat(widgets): simplify locations and paid sidebar

Remove deprecated widget locations and widgets, standardize sidebar labels, and render a compact paid-post purchase card in the article sidebar.

index.php

@@ -24,7 +24,7 @@ get_header();
 // Visibility is driven by body.site-layout-* (aksrt_is_show_sidebar), not widget presence.
 $has_sidebar = function_exists('aksrt_is_show_sidebar')
 	? aksrt_is_show_sidebar()
-	: is_active_sidebar('sidebar-blog');
+	: is_active_sidebar('home_sidebar');
 ?>
 <main id="main-content" class="site-main container" tabindex="-1">
 	<div class="content-wrap">