feat: Update blog

- Change blog from njk to liquid
- Update content

source/screens/demo/examples/blog.liquid

@@ -0,0 +1,32 @@
+---
+title: Blog
+tags:
+- demoExample
+---
+{% layout 'hippie/simple.liquid' %}
+
+{% block body %}
+<div class="sec_main_center">
+	<header class="header_txt">
+		<h1>Blog</h1>
+	</header>
+	<nav role="doc-toc">
+		<h2>Inhaltsverzeichnis</h2>
+		<ul>
+			{%- for blog in collections.blog -%}
+				<li>
+					<a href="{{ blog.page.url }}">{{ blog.data.title }}</a>
+				</li>
+			{%- endfor -%}
+		</ul>
+	</nav>
+	<hr class="double dotted">
+	{%- for post in collections.article -%}
+		<article>
+			{{ post.content }}
+		</article>
+	{%- endfor -%}
+	<hr/>
+	<address>{% text hippie.placeholders.name %}</address>
+</div>
+{% endblock %}