Add templates for simple content pages

templates/blog/blog_page.html

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+{% extends "base.html" %}
+
+{% load static %}
+
+{% block content %}
+<div id="main">
+    <div class="container">
+      {% include "common/content.html" %}
+    </div>
+  </div>
+{% endblock %}

templates/common/content.html

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+{% load wagtailcore_tags %}
+
+<div class="mb-3 image header-image" data-image=''></div>
+<h1 class="display-5">{{ page.title }}</h1>
+<h5 class="my-3">Subtitle</h5>
+<p>Details</p>
+<hr />
+<div class="content mt-3">
+    {% include_block page.body %}
+</div>

templates/pages/simple_content_page.html

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+{% extends "base.html" %}
+
+{% load static %}
+
+{% block content %}
+<div id="main">
+    <div class="container">
+      {% include "common/content.html" %}
+    </div>
+  </div>
+{% endblock %}