fix: remove sidebar experiment (codesandbox#3797)

* fix: remove sidebar experiment

* chore: delete unused  NewSidebar file

Author: jyash97

packages/app/src/app/pages/common/Modals/PreferencesModal/Experiments/NewSidebar.tsx

@@ -1,7 +1,6 @@
 import React from 'react';
 
 import { PreferenceContainer, Rule, SubContainer, Title } from '../elements';
-import { NewSidebar } from './NewSidebar';
 import { Comments } from './Comments';
 import { ContainerLSP } from './ContainerLSP';
 
@@ -15,8 +14,6 @@ export const Experiments: React.FunctionComponent = () => (
             <Comments /> <Rule />
           </>
         )}
-        <NewSidebar />
-        <Rule />
         <ContainerLSP />
       </PreferenceContainer>
     </SubContainer>