Add error page

[mmistakes]

E.g., 404.html

[mmistakes]

Unique error layout not needed, can use layout: page.

To create a custom 404 page for GitHub Pages hosted sites add /404.md to the root of your project with the following YAML front matter... replace with whatever title and body content you want.

---
title: Page not found
layout: page
permalink: /404.html
---

Sorry, but the page you were trying to view has moved or does not exist.