Add page place holders

hbbs/templates/collection.html

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+{% extends "layout.html" %}
+
+{% block content %}
+<p>TODO: collection page</p>
+{% endblock %}

hbbs/templates/participate.html

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+{% extends "layout.html" %}
+
+{% block content %}
+<p>TODO: participate page</p>
+{% endblock %}

hbbs/templates/programmes.html

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+{% extends "layout.html" %}
+
+{% block content %}
+<p>TODO: programmes page</p>
+{% endblock %}