Finish MVP for content editing

app/components/editable_content_component.html.erb

@@ -0,0 +1,9 @@
+<% if @editable_content.has_content? %>
+  <% if @editable_content.rich_text %>
+    <%= helpers.markdown_to_html @editable_content.content %>
+  <% else %>
+    <%= @editable_content.content %>
+  <% end %>
+<% else %>
+  <%= @default %>
+<% end %>