feat(site): Comunidade section with Instagram posts the gym was tagged in

Per-gym Graph API /tags fetch with file cache and local thumbnails, section after the gallery, navbar link and admin page (Gestão > Site).

includes/header.php

@@ -81,6 +81,7 @@ $app_name   = defined('APP_NAME') ? APP_NAME : 'FitMe 3070';
                 <?= bo_nav_link('views/admin/events/index.php', 'bi-megaphone', 'Eventos', ['mod' => 'sub2', 'match' => 'views/admin/events/']) ?>
                 <?= bo_nav_link('views/admin/info/edit.php', 'bi-telephone', 'Contactos', ['mod' => 'sub2', 'match' => 'views/admin/info/']) ?>
                 <?= bo_nav_link('views/admin/reviews/index.php', 'bi-star', 'Reviews Google', ['mod' => 'sub2', 'match' => 'views/admin/reviews/']) ?>
+                <?= bo_nav_link('views/admin/instagram/index.php', 'bi-instagram', 'Comunidade (Instagram)', ['mod' => 'sub2', 'match' => 'views/admin/instagram/']) ?>
             <?php bo_nav_group_end(); ?>
             <?php bo_nav_group_start('horarios', 'Horários', 'bi-clock-history', true); ?>
                 <?= bo_nav_link('views/admin/work_hours/index.php', 'bi-clock', 'Horário de Funcionamento', ['mod' => 'sub2', 'match' => 'views/admin/work_hours/']) ?>