Add author profiles

[stefanv]

With this change, I can add /content/authors/stefanv.md with:

---
title: Stéfan van der Walt
---

👋 Hi!

- My website is https://mentat.za.net
- You can reach me on Mastodon at https://emacs.ch/@stefanv

In the blogpost, I change the author field to:

author: ["Stéfan van der Walt <stefanv>"]

And it renders as a link on the blog post:

---

---

As well as the matching profile page:

---

---

Requested by @albertcthomas

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[albertcthomas]

Wow that was fast! :) thank you