add multiple base type page

backstage/templates/about.html

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+{% extends "layout.html" %}
+{% block content %}
+    <h1>Collection</h1>
+{% endblock content %}

backstage/templates/activity.html

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+{% extends "layout.html" %}
+{% block content %}
+    <h1>Activity</h1>
+{% endblock content %}

backstage/templates/frequently_asked_questions.html

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+{% extends "layout.html" %}
+{% block content %}
+    <h1>frequently_asked_questions</h1>
+{% endblock content %}

backstage/templates/room_planner.html

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+{% extends "layout.html" %}
+{% block content %}
+    <h1>room_planner</h1>
+{% endblock content %}

backstage/templates/solid_wood_furniture.html

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+{% extends "layout.html" %}
+{% block content %}
+    <h1>solid_wood_furniture</h1>
+{% endblock content %}

backstage/templates/system_furniture.html

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+{% extends "layout.html" %}
+{% block content %}
+    <h1>system_furniture</h1>
+{% endblock content %}