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/footer/version-info/version-info-modal.tsx

@@ -0,0 +1,64 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import React, { useMemo } from 'react'
+import type { CommonModalProps } from '../../../common/modals/common-modal'
+import { CommonModal } from '../../../common/modals/common-modal'
+import { Modal, Row } from 'react-bootstrap'
+import { VersionInfoModalColumn } from './version-info-modal-column'
+import frontendVersion from '../../../../version.json'
+import links from '../../../../links.json'
+import type { BackendVersion } from '../../../../api/config/types'
+import { useApplicationState } from '../../../../hooks/common/use-application-state'
+import { cypressId } from '../../../../utils/cypress-attribute'
+
+/**
+ * Renders a modal with the version information.
+ *
+ * @param onHide The callback to call if the modal should be closed
+ * @param show If the modal should be shown.
+ */
+export const VersionInfoModal: React.FC<CommonModalProps> = ({ onHide, show }) => {
+  const serverVersion: BackendVersion = useApplicationState((state) => state.config.version)
+  const backendVersion = useMemo(() => {
+    const version = `${serverVersion.major}.${serverVersion.minor}.${serverVersion.patch}`
+
+    if (serverVersion.preRelease) {
+      return `${version}-${serverVersion.preRelease}`
+    }
+
+    if (serverVersion.commit) {
+      return serverVersion.commit
+    }
+    return version
+  }, [serverVersion])
+
+  return (
+    <CommonModal
+      {...cypressId('version-modal')}
+      show={show}
+      onHide={onHide}
+      showCloseButton={true}
+      title={'landing.versionInfo.title'}>
+      <Modal.Body>
+        <Row>
+          <VersionInfoModalColumn
+            titleI18nKey={'landing.versionInfo.serverVersion'}
+            version={backendVersion}
+            issueTrackerLink={links.backendIssues}
+            sourceCodeLink={links.backendSourceCode}
+          />
+          <VersionInfoModalColumn
+            titleI18nKey={'landing.versionInfo.clientVersion'}
+            version={frontendVersion.version}
+            issueTrackerLink={frontendVersion.issueTrackerUrl}
+            sourceCodeLink={frontendVersion.sourceCodeUrl}
+          />
+        </Row>
+      </Modal.Body>
+    </CommonModal>
+  )
+}