Move layout options to their own section

app/javascript/flavours/glitch/features/local_settings/page/index.js

@@ -33,6 +33,8 @@ export default class LocalSettingsPage extends React.PureComponent {
     ({ intl, onChange, settings }) => (
       <div className='glitch local-settings__page general'>
         <h1><FormattedMessage id='settings.general' defaultMessage='General' /></h1>
+        <section>
+          <h2><FormattedMessage id='settings.layout_opts' defaultMessage='Layout options' /></h2>
           <LocalSettingsPageItem
             settings={settings}
             item={['layout']}
@@ -62,6 +64,7 @@ export default class LocalSettingsPage extends React.PureComponent {
           >
             <FormattedMessage id='settings.navbar_under' defaultMessage='Navbar at the bottom (Mobile only)' />
           </LocalSettingsPageItem>
+        </section>
         <section>
           <h2><FormattedMessage id='settings.compose_box_opts' defaultMessage='Compose box options' /></h2>
           <LocalSettingsPageItem