Move documents under actions (#31110)

Move secrets and badge under actions

docs/content/usage/actions/badge.en-us.md

@@ -0,0 +1,35 @@
+---
+date: "2023-02-25T00:00:00+00:00"
+title: "Badge"
+slug: "badge"
+sidebar_position: 11
+toc: false
+draft: false
+menu:
+  sidebar:
+    parent: "actions"
+    name: "Badge"
+    sidebar_position: 11
+    identifier: "Badge"
+---
+
+# Badge
+
+Gitea has its builtin Badge system which allows you to display the status of your repository in other places. You can use the following badges:
+
+## Workflow Badge
+
+The Gitea Actions workflow badge is a badge that shows the status of the latest workflow run.
+It is designed to be compatible with [GitHub Actions workflow badge](https://docs.github.com/en/actions/monitoring-and-troubleshooting-workflows/adding-a-workflow-status-badge).
+
+You can use the following URL to get the badge:
+
+```
+https://your-gitea-instance.com/{owner}/{repo}/actions/workflows/{workflow_file}?branch={branch}&event={event}
+```
+
+- `{owner}`: The owner of the repository.
+- `{repo}`: The name of the repository.
+- `{workflow_file}`: The name of the workflow file.
+- `{branch}`: Optional. The branch of the workflow. Default to your repository's default branch.
+- `{event}`: Optional. The event of the workflow. Default to none.