Add favorites page.

content/favorites.md

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+---
+title: Favorites
+type: "favorites"
+description: Posts from Daniel's personal blog that he has enjoyed writing the most, or that he thinks turned out very well.
+---
+The amount of content on this blog is monotonically increasing. Thus, as time goes on, it's becoming
+harder and harder to see at a glance what kind of articles I write. To address this, I've curated
+a small selection of articles from this site that I've particularly enjoyed writing, or that I think
+turned out especially well. They're listed below, most recent first.

themes/vanilla/layouts/favorites/single.html

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+{{ define "main" }}
+<h2>{{ .Title }} </h2>
+{{ .Content }}
+
+<ul class="post-list">
+    {{ range (where (where .Site.Pages.ByDate.Reverse "Section" "blog") ".Kind" "!=" "section") }}
+    {{ if .Params.favorite }}{{ partial "post.html" . }}{{ end }}
+    {{ end }}
+</ul>
+{{ end }}