[FEATURE] Ignore posts subfolders

[jamesdeluk]

Describe the feature you want 描述你的功能需求

Current functionality

Posts go in the content/posts/ folder.

1. If I had a post called post.md in posts, the URL would be mysite.com/posts/post.

2. If I had a post called post.md in a folder in posts, say topic, the URL would be mysite.com/posts/topic/post.

Requested functionality

2. (new): If I had a post called post.md in a folder in posts, say topic, the URL would be mysite.com/posts/post.

That is, I can use subfolders within posts for organisation, but this doesn't change the URL.

Example usage: I could put all old posts in an archive subfolder but the URL remains the same.

[jamesdeluk]

Seems it's a config.toml setting:

[permalinks]
  posts = ':sections/:title'

(https://gohugo.io/content-management/urls/)