fix: Move content into to frontend directory

Doing this BEFORE the merge prevents a lot of merge conflicts.

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

frontend/src/components/landing-layout/navigation/user-dropdown.tsx

@@ -0,0 +1,51 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import React from 'react'
+import { Dropdown } from 'react-bootstrap'
+import { Trans, useTranslation } from 'react-i18next'
+import { ForkAwesomeIcon } from '../../common/fork-awesome/fork-awesome-icon'
+import { UserAvatar } from '../../common/user-avatar/user-avatar'
+import { useApplicationState } from '../../../hooks/common/use-application-state'
+import { cypressId } from '../../../utils/cypress-attribute'
+import { SignOutDropdownButton } from './sign-out-dropdown-button'
+import Link from 'next/link'
+
+/**
+ * Renders a dropdown menu with user-relevant actions.
+ */
+export const UserDropdown: React.FC = () => {
+  useTranslation()
+  const user = useApplicationState((state) => state.user)
+
+  if (!user) {
+    return null
+  }
+
+  return (
+    <Dropdown align={'end'}>
+      <Dropdown.Toggle size='sm' variant='dark' {...cypressId('user-dropdown')} className={'d-flex align-items-center'}>
+        <UserAvatar user={user} />
+      </Dropdown.Toggle>
+
+      <Dropdown.Menu className='text-start'>
+        <Link href={'/n/features'} passHref={true}>
+          <Dropdown.Item dir='auto' {...cypressId('user-dropdown-features-button')}>
+            <ForkAwesomeIcon icon='bolt' fixedWidth={true} className='mx-2' />
+            <Trans i18nKey='editor.help.documents.features' />
+          </Dropdown.Item>
+        </Link>
+        <Link href={'/profile'} passHref={true}>
+          <Dropdown.Item dir='auto' {...cypressId('user-dropdown-profile-button')}>
+            <ForkAwesomeIcon icon='user' fixedWidth={true} className='mx-2' />
+            <Trans i18nKey='profile.userProfile' />
+          </Dropdown.Item>
+        </Link>
+        <SignOutDropdownButton />
+      </Dropdown.Menu>
+    </Dropdown>
+  )
+}