feat: Replace blank screen with liquid version

- Add title to full template
- Remove unnecessary title from screens
- Change CRLF to LF

source/screens/demo/pages/blank.liquid

@@ -0,0 +1,10 @@
+---
+title: Blank
+---
+{% assign pageBase = "../../" -%}
+{% assign pageId = page.fileSlug -%}
+{%- layout "hippie/full.liquid" %}
+
+{% block body %}
+<!-- {{ title }} -->
+{% endblock %}