Demo/Example link is broken.

Summary Demo/Example link is broken. (Summarize the bug encountered concisely)

Steps to reproduce "See FormSchema ElementUI Demo for a complete example." (How one can reproduce the issue - this is very important)

Example Project

(If possible, please create an example project here on GitLab.com that exhibits the problematic behaviour, and link to it here in the bug report)

What is the current bug behavior? i get 404, description says: The page could not be found or you don't have permission to view it. (What actually happens)