Archive old migrations (#426)

* Archive old migrations

* Fix invalid placement of migrations

migrations/archive/000.008.sql

@@ -0,0 +1,9 @@
+DO $$
+    BEGIN
+        BEGIN
+            ALTER TABLE designers ADD COLUMN visible_productpage INT DEFAULT 1;
+        EXCEPTION
+            WHEN duplicate_column THEN RAISE NOTICE 'column visible_productpage already exists in "designers".';
+        END;
+    END;
+$$