Add column name classes to <td>s, make PK bold

datasette/static/app.css

@@ -17,6 +17,9 @@ td {
     padding: 4px;
     vertical-align: top;
 }
+td.col-link {
+    font-weight: bold;
+}
 td em {
     font-style: normal;
     font-size: 0.8em;

datasette/templates/_rows_and_columns.html

@@ -20,7 +20,7 @@
     {% for row in display_rows %}
         <tr>
             {% for cell in row %}
-                <td>{{ cell.value }}</td>
+                <td class="col-{{ cell.column|lower }}">{{ cell.value }}</td>
             {% endfor %}
         </tr>
     {% endfor %}