[Glitch] Change public accounts pages to mount the web UI

Port 839f893168 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/components/error_boundary.js

@@ -4,6 +4,7 @@ import { FormattedMessage } from 'react-intl';
 import { source_url } from 'flavours/glitch/initial_state';
 import { preferencesLink } from 'flavours/glitch/utils/backend_links';
 import StackTrace from 'stacktrace-js';
+import { Helmet } from 'react-helmet';
 
 export default class ErrorBoundary extends React.PureComponent {
 
@@ -122,6 +123,10 @@ export default class ErrorBoundary extends React.PureComponent {
             )}
           </ul>
         </div>
+
+        <Helmet>
+          <meta name='robots' content='noindex' />
+        </Helmet>
       </div>
     );
   }

app/javascript/flavours/glitch/components/missing_indicator.js

@@ -3,6 +3,7 @@ import PropTypes from 'prop-types';
 import { FormattedMessage } from 'react-intl';
 import illustration from 'flavours/glitch/images/elephant_ui_disappointed.svg';
 import classNames from 'classnames';
+import { Helmet } from 'react-helmet';
 
 const MissingIndicator = ({ fullPage }) => (
   <div className={classNames('regeneration-indicator', { 'regeneration-indicator--without-header': fullPage })}>
@@ -14,6 +15,10 @@ const MissingIndicator = ({ fullPage }) => (
       <FormattedMessage id='missing_indicator.label' tagName='strong' defaultMessage='Not found' />
       <FormattedMessage id='missing_indicator.sublabel' defaultMessage='This resource could not be found' />
     </div>
+
+    <Helmet>
+      <meta name='robots' content='noindex' />
+    </Helmet>
   </div>
 );