"Prototype" pages feature for paginated archives of categories, tags, and other front matter values

[jaredcwhite]

It's pretty late (even for me these days!) so I'll write up a better description in the morning. Essentially, you can do this:

_posts/2020-04-10-article-by-jared.md

---
title: I'm an article
author: jared
---

Content goes here.

_data/authors.yml

jared:
  name: Jared White
  twitter: jaredcwhite

authors/author.html

---
layout: default
title: Articles by :prototype-data-label
prototype:
  term: author
  data: authors
  data_label: name
---

<h1>{{ page.title }}</h1> <-- Articles by Jared White -->

<h2>Twitter: @{{ page.author_data.twitter }}</h2> <!-- Twitter: @jaredcwhite -->

<!-- posts where author == jared -->
{% for post in paginator.documents %}
  {% include post.html %}
{% endfor %}

[jaredcwhite]

P. S. Needs some feature tests.

[jaredcwhite]

LGTM 👍