pidgin/nest

Enable OpenGraph and Twitter Cards on all pages and add relevant fields to default archetypes

Testing Done:
Checked on local, confirmed in source that tags appear and populate properly

Bugs closed: NEST-14

Reviewed at https://reviews.imfreedom.org/r/139/
---
title: "{{ replace .Name "-" " " | title }}"
date: {{ .Date }}
replaces: []
description: "" # Leave blank to use the auto summary
audio: [] # Links to any audio files on the page
images: [] # Leave empty to default to the Pidgin logo
series: [] # Appears as "See also" pages on Facebook
---