JordanRM23/DemonListEC ? reverse-engineered prompt

Build me a Geometry Dash demon list website using this template, where I can view a ranked list of levels and the records people have submitted for them.

I want the site to load the level data from JSON style files, show useful error messages if a level entry is broken, and make it easy to add or edit levels and records without messing up the whole site. It should also support mobile records with a simple mobile true flag, and keep the existing credits for the original Shitty List template somewhere visible.

If there is already a backend, Discord bot, or database setup in the project, wire it up so the list can work smoothly and I can update content later. Make sure it runs locally, and if anything is unclear, look up current docs online if you need to. Also please keep the design clean enough that it feels like a real list website instead of a raw template.