Adding a new page in the Policy section of the knowledge base requires it to be added to the site generation configuration. Specifically, the site/sidebars.js file needs to be updated to show this page.

BTW...the screenshot generated in this review was done so by updating the config to look like this:

        {
          type: 'category',
          label: 'Policy',
          link: {
            type: 'doc',
            id: 'knowledge_base/policy',
          },
          items: [
            'knowledge_base/policy_basics',
            'knowledge_base/policy_development',
            'knowledge_base/policy_examples',
            'knowledge_base/policy_apply',
            'knowledge_base/policy_phylum',
          ],
        },

The order of the page in relation to the others should be reviewed but in this case it was just added to the end. Then, the page was reviewed by following along with the site/README.md:

## Change into the `site` directory
cd site

## Install the package/dependencies
npm ci

## Build the page locally
npm run build

## Serve the page locally
npm run serve

Lastly, when adding new pages, ensure the filename is good because it will serve as the slug for the URL and, once published the first time, will be a bit harder to change. Not impossible, just a bit harder. I'm not saying policy_phylum.md is a bad name...just that this is the chance to dial it in.