fix: Remove dead demo

README.md

@@ -1784,7 +1784,7 @@ An [integrated development environment (IDE)](https://en.wikipedia.org/wiki/Inte
 - [JupyterLab](https://jupyterlab.github.io/jupyterlab/) - Web-based environment for interactive and reproducible computing. ([Demo](https://mybinder.org/v2/gh/jupyterlab/jupyterlab-demo/try.jupyter.org?urlpath=lab), [Source Code](https://github.com/jupyterlab/jupyterlab/)) `BSD-3-Clause` `Python/Docker`
 - [Lowdefy](https://www.lowdefy.com/) - Build internal tools, BI dashboards, admin panels, CRUD apps and workflows in minutes using YAML / JSON on an self-hosted, open-source platform. Connect to your data sources, host via Serverless, Netlify or Docker. ([Source Code](https://github.com/lowdefy/lowdefy)) `Apache-2.0` `Nodejs`
 - [ML Workspace](https://github.com/ml-tooling/ml-workspace) - All-in-one web-based IDE for machine learning and data science. `Apache-2.0` `Docker`
-- [Motor Admin](https://www.getmotoradmin.com/) - No-code admin panel and business intelligence software - search, create, update, and delete data entries, create custom actions, and build reports. ([Demo](https://motor-admin.herokuapp.com/demo/), [Source Code](https://github.com/motor-admin/motor-admin)) `AGPL-3.0` `Ruby`
+- [Motor Admin](https://www.getmotoradmin.com/) - No-code admin panel and business intelligence software - search, create, update, and delete data entries, create custom actions, and build reports. ([Source Code](https://github.com/motor-admin/motor-admin)) `AGPL-3.0` `Ruby`
 - [RStudio Server](https://www.rstudio.com/products/rstudio/#Server) - Web browser based IDE for R. ([Source Code](https://github.com/rstudio/rstudio)) `AGPL-3.0` `Java/C++`
 - [sourcegraph](https://sourcegraph.com) - Sourcegraph is a fast, open-source, fully-featured code search and navigation engine written in Go. ([Source Code](https://github.com/sourcegraph/sourcegraph)) `Apache-2.0` `Go`
 - [Wakapi](https://wakapi.dev/) - Tracking tool for coding statistics, compatible with WakaTime. ([Source Code](https://github.com/muety/wakapi)) `GPL-3.0` `Go`