Show ImageMap title/usage/description on map page

app/frontend/stylesheets/_map.scss

@@ -96,6 +96,11 @@ main.show.map {
 												background: $link-color;
 										}
 								}
+								details {
+										margin-top:1ex;
+										border-top: 1px solid grey;
+										padding-top: 2px;
+								}
 						}
 				}
 		}

app/views/maps/show.html.erb

@@ -41,6 +41,9 @@
 					<%= im.sizeinfo_s %><br />
 					<%= link_to '↓ download', rails_blob_path(im.image), download: im.name %>
 					<%= link_to 'edit', im %>
+					<details>
+						<summary><%= im.title || '–––' %>, <%= im.usage %></summary>
+						<%= im.description %>
 				</figcaption>
 			</figure>
 		<% end %>