Pull request: add UI theme controls

Updates #5620

Squashed commit of the following:

commit a7095b8ba35c34d333b0bbe772ac02a4ba90fbfd
Author: Ildar Kamalov <ik@adguard.com>
Date:   Fri Mar 24 17:23:27 2023 +0300

    fix icon

commit ea565f152a1ce4ad8797cf36cacdfd67146a125d
Merge: 5ebb20d2 67c9abe1
Author: Ildar Kamalov <ik@adguard.com>
Date:   Fri Mar 24 17:20:42 2023 +0300

    Merge branch 'master' into AG-20691

commit 5ebb20d298735982f3c547c81ade4384f4f62196
Merge: 41b0d597 0bc3ef89
Author: Ildar Kamalov <ik@adguard.com>
Date:   Fri Mar 24 14:37:05 2023 +0300

    Merge branch 'master' into AG-20691

commit 41b0d597a68006397a7561dfffb1fb51068ded2c
Author: Ildar Kamalov <ik@adguard.com>
Date:   Fri Mar 24 14:20:20 2023 +0300

    fix string

commit 775afb99fb5ffd17118becba4f1e83d4ce77be48
Author: Ildar Kamalov <ik@adguard.com>
Date:   Thu Mar 23 19:03:45 2023 +0300

    client: add ui theme controls

client/src/components/ui/Guide/Guide.js

@@ -7,7 +7,6 @@ import { useSelector } from 'react-redux';
 import { MOBILE_CONFIG_LINKS } from '../../../helpers/constants';
 
 import Tabs from '../Tabs';
-import Icons from '../Icons';
 import MobileConfigForm from './MobileConfigForm';
 
 const renderLi = ({ label, components }) => <li key={label}>
@@ -341,7 +340,6 @@ const Guide = ({ dnsAddresses }) => {
             >
                 {activeTab}
             </Tabs>
-            <Icons />
         </div>
     );
 };