Fix more links and problems (#3)

Reviewed-on: https://gitea.com/gitea/docs/pulls/3

docs/actions.md

@@ -1,13 +0,0 @@
----
-date: "2023-04-27T14:00:00+08:00"
-title: "Actions"
-slug: "actions"
-sidebar_position: 36
-toc: false
-draft: false
-menu:
-  sidebar:
-    name: "Usage - Actions"
-    sidebar_position: 31
-    identifier: "actions"
----

docs/index.md

@@ -1,10 +1,7 @@
 ---
 date: "2016-11-08T16:00:00+02:00"
-title: "Documentation"
 slug: /
 sidebar_position: 10
-toc: false
-draft: false
 ---
 
 # What is Gitea?

docs/packages.md

@@ -1,13 +0,0 @@
----
-date: "2016-12-27T16:00:00+02:00"
-title: "Packages"
-slug: "packages"
-sidebar_position: 35
-toc: false
-draft: false
-menu:
-  sidebar:
-    name: "Usage - Packages"
-    sidebar_position: 30
-    identifier: "packages"
----