Need to redirect “file not found” errors to home page

[gmoskowitzQF]

I am using mkdocs to create a documentation web site. The web site is accessed by an application via a Help button – when the user clicks the Help button, a specific topic page opens. Sometimes this topic page will have the wrong file name of will not exist yet. In these cases, the browser displays a “file not found” error. Instead of this error, I want it to display the home page (index.md or index.html). I can’t figure out how to do this. The mkdocs “redirects” plugin hasn’t worked yet; I don’t think it’s designed for what I want to do. Have you encountered this problem before and if so, how did you fix it?