Remove unnecessary meta data on markdown files (#12)

Reviewed-on: https://gitea.com/gitea/docs/pulls/12

versioned_docs/version-1.22/usage/packages/container.md

@@ -1,16 +1,6 @@
 ---
 date: "2021-07-20T00:00:00+00:00"
-title: "Container Registry"
 slug: "container"
-sidebar_position: 30
-draft: false
-toc: false
-menu:
-  sidebar:
-    parent: "packages"
-    name: "Container Registry"
-    sidebar_position: 30
-    identifier: "container"
 ---
 
 # Container Registry