fix readme

Author: ganisback

README.md

@@ -5,14 +5,13 @@
 LLM scheduler UI is an open source web interface to LLM jobs. the scheduler engine is using [Slurm](https://slurm.schedmd.com/) as default engine
 It performs large model jobs scheduling based on GPU resources.
 
+[![Demo](public/demo.png)](https://www.bilibili.com/video/BV1hH4y1G73D/?vd_source=998127e911ff03443d75c8df2b3d33e8)
+
 ## Prerequisite
 
 please setup scheduler API fisrtly [llm-scheduler-api](https://github.com/OpenCSGs/llm-scheduler-api)
 then configure the environment variable in .env
 
-<video src="https://github.com/ganisback/video/blob/9d332ed1b526498e615a533deb43f2450aaa4d06/demo.mp4" width="800px" height="600px" controls="controls"></video>
-
-
 ## Quick Start
 1. install dependency
 ```bash