fix: localize Pages layout and implement /uslugi subpage blocks

src/blocks/PageHeader/config.ts

@@ -0,0 +1,9 @@
+import type { Block } from 'payload'
+
+export const PageHeader: Block = {
+  slug: 'pageHeader',
+  fields: [
+    { name: 'title', type: 'text', required: true },
+    { name: 'subtitle', type: 'textarea' },
+  ],
+}