Public: stacked before/after and editable welcome text; admin media/comments mode polish

migrations/002_site_settings.sql

@@ -0,0 +1,5 @@
+CREATE TABLE IF NOT EXISTS site_settings (
+  `key` VARCHAR(191) PRIMARY KEY,
+  `value` TEXT NULL,
+  updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;