chore: initialize public repository

app/templates/ui/empty_state.html

@@ -0,0 +1,6 @@
+{% macro empty_state(title, text='') -%}
+  <section class="empty-state">
+    <h2 class="empty-state__title">{{ title }}</h2>
+    {% if text %}<p class="empty-state__text muted">{{ text }}</p>{% endif %}
+  </section>
+{%- endmacro %}