[TASK] Split up "Help within TYPO3" chapter

[brotkrueml]

Previously, the keyboard commands were already on a separate page which was displayed as a link at the bottom of the help page and can easily overlooked. As the keyboard commands chapter is already a bit longer, the other topics have been moved to separate pages (instead of integrating the keyboard commands into the existing page). This also leaves room for improvement of each topic.

Releases: main, 12.4

[github-actions]

The backport to 12.4 failed:

The process '/usr/bin/git' failed with exit code 1

stderr

error: could not apply 7a2aaa4... [TASK] Split up "Help within TYPO3" chapter
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".

stdout

CONFLICT (modify/delete): Documentation/Localization.ru_RU/HelpInside/Index.rst deleted in HEAD and modified in 7a2aaa4 ([TASK] Split up "Help within TYPO3" chapter).  Version 7a2aaa4 ([TASK] Split up "Help within TYPO3" chapter) of Documentation/Localization.ru_RU/HelpInside/Index.rst left in tree.

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-12.4 12.4
# Navigate to the new working tree
cd .worktrees/backport-12.4
# Create a new branch
git switch --create backport-161-to-12.4
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 7a2aaa439db689dab3c52e5cacf33632f99cd8f6
# Push it to GitHub
git push --set-upstream origin backport-161-to-12.4
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-12.4

Then, create a pull request where the base branch is 12.4 and the compare/head branch is backport-161-to-12.4.