[Doc] Add demos page

docs/Demos.md

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+---
+layout: default
+title: "React-admin demos"
+---
+
+# React-admin Demos
+
+If you want to see what react-admin is capable of, or if you want to learn from apps built by seasoned react-admin developers, check out these demos.
+
+## E-commerce
+
+The admin of a fictional poster shop, allowing to manage sales, products, customers and reviews. Built by the core team.
+
+[![react-admin-demo](https://marmelab.com/react-admin/img/react-admin-demo-still.png)](https://vimeo.com/268958716)
+
+* Demo: [https://marmelab.com/react-admin-demo/](https://marmelab.com/react-admin-demo/)
+* Source code: [https://github.com/marmelab/react-admin/tree/master/examples/demo](https://github.com/marmelab/react-admin/tree/master/examples/demo)
+
+The source shows how to implement the following features:
+
+- [Custom theme with white AppBar](https://github.com/marmelab/react-admin/blob/master/examples/demo/src/layout/themes.ts)
+- [d3.js chart with Recharts](https://github.com/marmelab/react-admin/blob/master/examples/demo/src/dashboard/OrderChart.tsx)
+- [List widget embedded in another page](https://github.com/marmelab/react-admin/blob/master/examples/demo/src/dashboard/NewCustomers.tsx)
+- [Tabbed Datagrid](https://github.com/marmelab/react-admin/blob/master/examples/demo/src/orders/OrderList.tsx)
+- [Row expand with a custom show view](https://github.com/marmelab/react-admin/blob/master/examples/demo/src/invoices/InvoiceList.tsx)
+- [Grid list showing a list of images](https://github.com/marmelab/react-admin/blob/master/examples/demo/src/products/GridList.tsx)
+- [Filter sidebar](https://github.com/marmelab/react-admin/blob/master/examples/demo/src/products/Aside.tsx)
+- [Custom form layout](https://github.com/marmelab/react-admin/blob/master/examples/demo/src/visitors/VisitorEdit.tsx)
+- [Custom page with static list](https://github.com/marmelab/react-admin/blob/master/examples/demo/src/routes.tsx)
+- [Edit view in a sidebar](https://github.com/marmelab/react-admin/blob/master/examples/demo/src/reviews/ReviewList.tsx)
+
+## CRM
+
+A complete CRM app allowing to manage contacts, companies, deals, notes, tasks, and tags. Built by the core team.
+
+<video src="https://user-images.githubusercontent.com/99944/116970434-4a926480-acb8-11eb-8ce2-0602c680e45e.mp4" controls="controls" style="max-width: 100%"></video>
+
+* Demo: [https://marmelab.com/react-admin-crm/](https://marmelab.com/react-admin-crm/)
+* Source code: [https://github.com/marmelab/react-admin/tree/master/examples/crm](https://github.com/marmelab/react-admin/tree/master/examples/crm)
+
+The source shows how to implement the following features:
+
+- [Horizontal navigation](https://github.com/marmelab/react-admin/blob/7c60db09aea34a90607a4e7560e9e4b51bd7b9a3/examples/crm/src/Layout.tsx)
+- [Custom d3.js / Nivo Chart in the dashboard](https://github.com/marmelab/react-admin/blob/7c60db09aea34a90607a4e7560e9e4b51bd7b9a3/examples/crm/src/dashboard/DealsChart.tsx)
+- [Add or remove tags to a contact](https://github.com/marmelab/react-admin/blob/7c60db09aea34a90607a4e7560e9e4b51bd7b9a3/examples/crm/src/contacts/TagsListEdit.tsx)
+- [Use dataProvider hooks to update notes](https://github.com/marmelab/react-admin/blob/7c60db09aea34a90607a4e7560e9e4b51bd7b9a3/examples/crm/src/notes/Note.tsx)
+- [Custom grid layout for companies](https://github.com/marmelab/react-admin/blob/7c60db09aea34a90607a4e7560e9e4b51bd7b9a3/examples/crm/src/companies/GridList.tsx)
+- [Filter by "my favorites" in the company list](https://github.com/marmelab/react-admin/blob/7c60db09aea34a90607a4e7560e9e4b51bd7b9a3/examples/crm/src/deals/OnlyMineInput.tsx)
+- [Trello-like board for the deals pipeline](https://github.com/marmelab/react-admin/blob/7c60db09aea34a90607a4e7560e9e4b51bd7b9a3/examples/crm/src/deals/DealListContent.tsx)
+
+
+## Blog
+
+A simple application with posts, comments and users that we use for our e2e tests. Not designed to have a good UX, but to use most of the react-admin features. Built by the core team.
+
+![Blog demo](./img/blog_demo.png)
+
+* Demo: [https://iuxnw.sse.codesandbox.io/](https://iuxnw.sse.codesandbox.io/)
+* Source code: [https://codesandbox.io/s/github/marmelab/react-admin/tree/master/examples/simple](https://codesandbox.io/s/github/marmelab/react-admin/tree/master/examples/simple)
+
+## Other Apps
+
+Check out [Issue #4027](https://github.com/marmelab/react-admin/issues/4027) on the react-admin GitHub for a list of apps built by other people.
+
+### Navidrome
+
+A Spotify clone, allowing to manage songs, artists, playlists, and favorites.
+
+![Navidrome](./img/navidrome.png)
+
+* Demo: [https://demo.navidrome.org/app/](https://demo.navidrome.org/app/)
+* Source code: [https://github.com/navidrome/navidrome/](https://github.com/navidrome/navidrome/)
+
+### Broadcom Layer 7 API Hub
+
+A framework built on top of react-admin for building developer portals.
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/ecHsgNmug9E" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
+
+* Source code: [https://github.com/CAAPIM/APIHub](https://github.com/CAAPIM/APIHub)
+
+### Your App Here / showcase
+
+Did you publish an app built with react-admin with open-source code? Open a PR on this page to add it to this list.

docs/_layouts/default.html

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                             >
                         </li>
                         <li>
-                            <a href="https://marmelab.com/react-admin-demo"
-                                >Demo</a
+                            <a href="https://marmelab.com/react-admin/Demos.html"
+                                >Demos</a
                             >
                         </li>
                         <li>