Is your feature request related to a problem? Please describe.

Hi, I want to use hero image which can be fetched by URL e.g. https://.../image.png like this:

---
title: Using Article Hero Image by URL
author: Tanaka Tarou
date: 2020-05-14
hero: https://.../image.png
excerpt: How can I do it?
---

But it end up with,

![image](https://user-images.githubusercontent.co

Problem

Right now in all of the blog themes the next/previous post links are very blank and simplistic - it would be nice to make these a bit nicer and easier to use, maybe incorporate some featured images, etc.

Possible solution

The post footer is contained in the file src/components/post-footer.js and would be an easy place to jump in and start playing around.