restructure to account for new theme, add new build process, update readme

docs/source/_templates/layout.html

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+{# layout.html #}
+{# Import the layout of the theme. #}
+{% extends "!layout.html" %}
+
+{% block extrahead %}
+<meta name="twitter:card" content="summary">
+<meta name="twitter:site" content="@start9labs">
+<meta name="og:title" content="Start9 Docs">
+<meta property="og:image" content="https://start9.com/images/icon.png" />
+<meta name="og:description"
+  content="Documentation, guides, and FAQ for Start9 software and hardware products, as well as general information about open source technologies, Bitcoin, Lightning, and Tor.">
+{% endblock %}

docs/source/_templates/versioning.html

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+{% if versions %}
+<h3>{{ _('Branches') }}</h3>
+<ul>
+  {%- for item in versions.branches %}
+  <li><a href="{{ item.url }}">{{ item.name }}</a></li>
+  {%- endfor %}
+</ul>
+<h3>{{ _('Tags') }}</h3>
+<ul>
+  {%- for item in versions.tags %}
+  <li><a href="{{ item.url }}">{{ item.name }}</a></li>
+  {%- endfor %}
+</ul>
+{% endif %}
+<!-- <h1>*testing versions*</h1> -->