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>

src/components/editor-page/document-bar/revisions/invert-unified-patch.ts

@@ -1,47 +0,0 @@
-/*
- * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
- *
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import type { Hunk, ParsedDiff } from 'diff'
-
-/**
- * Inverts a given unified patch.
- * A patch that e.g. adds a line, will remove it then.
- *
- * @param parsedDiff The patch to invert
- * @return The inverted patch
- */
-export const invertUnifiedPatch = (parsedDiff: ParsedDiff): ParsedDiff => {
-  const { oldFileName, newFileName, oldHeader, newHeader, hunks, index } = parsedDiff
-
-  const newHunks: Hunk[] = hunks.map((hunk) => {
-    const { oldLines, oldStart, newLines, newStart, lines, linedelimiters } = hunk
-    return {
-      oldLines: newLines,
-      oldStart: newStart,
-      newLines: oldLines,
-      newStart: oldStart,
-      linedelimiters: linedelimiters,
-      lines: lines.map((line) => {
-        if (line.startsWith('-')) {
-          return `+${line.slice(1)}`
-        } else if (line.startsWith('+')) {
-          return `-${line.slice(1)}`
-        } else {
-          return line
-        }
-      })
-    }
-  })
-
-  return {
-    hunks: newHunks,
-    index: index,
-    newFileName: oldFileName,
-    newHeader: oldHeader,
-    oldFileName: newFileName,
-    oldHeader: newHeader
-  }
-}