docs(open-webui): Embed X demo of Open WebUI with ollama backend

doc/open-webui.md

@@ -2,6 +2,11 @@
 
 [Open WebUI](https://github.com/open-webui/open-webui) is a user-friendly WebUI for LLMs. It supports various LLM runners, including [[ollama]] and OpenAI-compatible APIs.
 
+See the demo with [[ollama]] backend:
+<center>
+<blockquote class="twitter-tweet" data-media-max-width="560"><p lang="en" dir="ltr">Want to run your own AI chatbot (like ChatGPT) locally? You can do that with Nix.<br><br>Powered by services-flake (<a href="https://twitter.com/hashtag/NixOS?src=hash&amp;ref_src=twsrc%5Etfw">#NixOS</a>), using <a href="https://twitter.com/OpenWebUI?ref_src=twsrc%5Etfw">@OpenWebUI</a> and <a href="https://twitter.com/ollama?ref_src=twsrc%5Etfw">@ollama</a>. <br><br>See example: <a href="https://t.co/dyItC93Pya">https://t.co/dyItC93Pya</a> <a href="https://t.co/DeDow8bEPw">pic.twitter.com/DeDow8bEPw</a></p>&mdash; NixOS Asia (@nixos_asia) <a href="https://twitter.com/nixos_asia/status/1803065244568244578?ref_src=twsrc%5Etfw">June 18, 2024</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
+</center>
+
 {#start}
 ## Getting Started