New documentation

First commit, halfway through a major restructuring of documentation.

docs/_includes/image.html

@@ -0,0 +1 @@
+<figure>{% if {{include.url}} %}<a class="no_icon" target="_blank" rel="noopener" href="images/{{include.file}}">{% endif %}<img width="100%" src="images/{{include.file}}" alt="{{include.alt}}" {% if {{include.max-width}} %}style="max-width: {{include.max-width}}px"{% endif %} />{% if {{include.url}} %}</a>{% endif %}{% if {{include.caption}} %}<figcaption>{{include.caption}}</figcaption>{% endif %}</figure>