Update meta data of docs

docs/development/api-usage.md

@@ -1,6 +1,5 @@
 ---
 date: "2018-06-24:00:00+02:00"
-title: "API Usage"
 slug: "api-usage"
 sidebar_position: 40
 aliases:

docs/development/hacking-on-gitea.md

@@ -1,6 +1,5 @@
 ---
 date: "2016-12-01T16:00:00+02:00"
-title: "Hacking on Gitea"
 slug: "hacking-on-gitea"
 sidebar_position: 10
 aliases:

docs/development/integrations.md

@@ -1,6 +1,5 @@
 ---
 date: "2019-04-15T17:29:00+08:00"
-title: "Integrations"
 slug: "integrations"
 sidebar_position: 65
 aliases:

docs/development/migrations.md

@@ -1,13 +1,12 @@
 ---
 date: "2019-04-15T17:29:00+08:00"
-title: "Migrations Interfaces"
 slug: "migrations-interfaces"
 sidebar_position: 55
 aliases:
   - /en-us/migrations-interfaces
 ---
 
-# Migration Features
+# Migration Interfaces
 
 Complete migrations were introduced in Gitea 1.9.0. It defines two interfaces to support migrating
 repository data from other Git host platforms to Gitea or, in the future, migrating Gitea data to other Git host platforms.

docs/development/oauth2-provider.md

@@ -1,13 +1,12 @@
 ---
 date: "2023-06-01T08:40:00+08:00"
-title: "OAuth2 provider"
 slug: "oauth2-provider"
 sidebar_position: 41
 aliases:
   - /en-us/oauth2-provider
 ---
 
-# OAuth2 provider
+# OAuth2 Provider
 
 Gitea supports acting as an OAuth2 provider to allow third party applications to access its resources with the user's consent. This feature is available since release 1.8.0.