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/slide-show-page/slide-show-page-content.tsx

@@ -0,0 +1,51 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import React, { useMemo } from 'react'
+import {
+  CommunicationMessageType,
+  RendererType
+} from '../render-page/window-post-message-communicator/rendering-message'
+import { RenderIframe } from '../editor-page/renderer-pane/render-iframe'
+import { updateNoteTitleByFirstHeading } from '../../redux/note-details/methods'
+import { useTranslation } from 'react-i18next'
+import { useTrimmedNoteMarkdownContentWithoutFrontmatter } from '../../hooks/common/use-trimmed-note-markdown-content-without-frontmatter'
+import { useSendToRenderer } from '../render-page/window-post-message-communicator/hooks/use-send-to-renderer'
+import { useApplicationState } from '../../hooks/common/use-application-state'
+import { setRendererStatus } from '../../redux/renderer-status/methods'
+
+/**
+ * Renders the current markdown content as a slideshow.
+ */
+export const SlideShowPageContent: React.FC = () => {
+  const markdownContentLines = useTrimmedNoteMarkdownContentWithoutFrontmatter()
+  useTranslation()
+
+  const slideOptions = useApplicationState((state) => state.noteDetails.frontmatter.slideOptions)
+  const rendererReady = useApplicationState((state) => state.rendererStatus.rendererReady)
+  useSendToRenderer(
+    useMemo(
+      () => ({
+        type: CommunicationMessageType.SET_SLIDE_OPTIONS,
+        slideOptions
+      }),
+      [slideOptions]
+    ),
+    rendererReady
+  )
+
+  return (
+    <div className={'vh-100 vw-100'}>
+      <RenderIframe
+        frameClasses={'h-100 w-100'}
+        markdownContentLines={markdownContentLines}
+        rendererType={RendererType.SLIDESHOW}
+        onFirstHeadingChange={updateNoteTitleByFirstHeading}
+        onRendererStatusChange={setRendererStatus}
+      />
+    </div>
+  )
+}