Split the Entity Explorer out into it's own SPA demo.

[Decipher]

Is your feature request related to a problem? Please describe.
The Entity Explorer is an added extra that is not linked or really directly related to the purpose of this demo site.

Describe the solution you'd like
Remove the demo and dependencies from this project and move them to it's own SPA demo that is hosted on Netlify or Vercel or similar.

Describe alternatives you've considered
N/A

Additional context
N/A