Document how to make the repository fully private in GitHub

[Copilot]

The repo already avoids publishing features publicly, but it still lacked explicit guidance for the remaining GitHub-side step: changing repository visibility. This update adds a short README section that tells maintainers exactly where to find that setting and how to use it.

• README: repository visibility instructions

  • adds a dedicated section for making the repo fully private in GitHub
  • documents the exact navigation path: Settings → General → Danger Zone → Change repository visibility
  • includes the final action (Make private) and the confirmation requirement

• README: wording alignment

  • updates the private-use note to describe the intended repository state without implying the GitHub visibility setting is already applied
  • keeps the note near the top of the README, after the repo description, for quick discoverability

• README: admin-access caveat

  • notes that missing Settings / visibility controls usually means the viewer does not have admin permissions

## How to make the GitHub repository private

To make this repository private, follow these steps in the GitHub web UI:

1. Open the repository on GitHub.
2. Click the **Settings** tab near the top of the repository page.
3. In the left sidebar, click **General**.
4. Scroll all the way down to **Danger Zone**.
5. Find **Change repository visibility** and click it.
6. Choose **Make private**.

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