Render build commands with text binding (#324)

Drop build command html binding for text binding instead

This was HTML binding as the colored ANSI output used ansiup and
sanitize-html to produce colored HTML output. While we are still waiting
on that, we can instead use a simple text binding.

- Refs #71

readthedocsext/theme/templates/builds/build_detail.html

@@ -274,7 +274,7 @@ <h3>{% trans "Build Errors" %}</h3>
                 </a>
               </td>
               <td class="stdout">
-                <code data-bind="html: output"></code>
+                <code data-bind="text: output"></code>
               </td>
             </tr>
           </tbody>