Add the option to exclude sub-directories.

@iveptawebadmin Thanks for opening the discussion. Let us follow it up here as this will become an enhancement to the CMS.

Discussed in #172

^{Originally posted by iveptawebadmin November 9, 2021}
On my Hugo site, many of my pages like about.md, contact.md, etc. are in the root of my content directory.
Then I have subdirectories for subsections of the site like blog, events, etc. that have pages within them.

I would like the root content pages to be shown in a 'Pages' section, and then news posts to be in a 'News' section and so on.
Is there a way to set this up so that the 'Pages' folder does not look into any of the subdirectories within the content directory?

"frontMatter.content.pageFolders": [
    {
      "title": "Pages",
      "path": "[[workspace]]/content"
    },
    {
      "title": "News",
      "path": "[[workspace]]/content/news"
    }
  ],

Right now the 'Pages' folder has all the files from every subdirectory within content.