feat: Replace nunjucks with new template and screen

- Replace ui index with liquid
- Add simple template inheriting from default

source/templates/hippie/simple.liquid

@@ -0,0 +1,15 @@
+{% assign pageId = page.fileSlug -%}
+{% layout "hippie/default.liquid" %}
+
+{% block title %}{{ title }}{% endblock %}
+
+{% block links %}
+{{ block.super -}}
+<link href="/css/demo.css" media="all" rel="stylesheet"/>
+{% endblock %}
+
+{% block script %}
+<script src="/vendor/hippie-script.js"></script>
+<script src="/js/globals.js"></script>
+<script src="/js/app.js"></script>
+{% endblock %}