Add a Fediverse statistics page

[Abbe98]

Description

First take on a statistics page for the Fediverse. It still needs to be integrated with the suggestions in #634.

If you want to build this against WDQS you need to remove countries otherwise it will take ages for it to build until we can merge this and update the cache repository.

Screenshot

Issue Reference

Fixes #554

Checklist

Please ensure the following before submitting the PR:

• I have tested the changes locally, and they work as expected.
• The code follows the project's coding standards and conventions.
• I have updated relevant documentation (if needed).
• I have added unit tests or performed manual testing where necessary.