feat(widgets): pricing/FAQ/stats + forum topic list and bbs sidebars

Add zibll produck widgets (pricing plans, FAQ, stats), forum topic
lists, register bbs_* sidebar zones, and wire plate/topic/home/compose
templates to render those widget areas.

templates/pages/page-forums.php

@@ -348,6 +348,11 @@ if (empty($public_home_tabs)) {
                     </ul>
                 </div>
                 <?php endif; ?>
+                <?php if (is_active_sidebar('bbs_home_sidebar')) : ?>
+                <div class="aksrt-forum-widget-zone">
+                    <?php dynamic_sidebar('bbs_home_sidebar'); ?>
+                </div>
+                <?php endif; ?>
             </aside>
                     </div>
                 </div>