Commit help_sections data file

The help_sections.rs file was added to the tarball only as a quick hack.
There is a cyclic dependency between docs and fish:

"fish_indent" via "crates/build-man-pages" depends on "doc_src/".
So every "touch doc_src/foo.rst && ninja -Cbuild sphinx-docs"
re-builds fish.

In future "fish_indent" should not depend on "crates/build-man-pages".
Until then, a following commit wants to break this cyclic dependency
in a different way: we won't embed man pages (matching historical
behavior), which means that CMake builds won't need to run
sphinx-build.

But sphinx-build is also used for extracting help sections.

Also, the fix for #12082 will use help sections elsewhere in the code.

Prepare to remove the dependency on doc_src by committing the help
sections (we already do elsewhere).

share/help_sections

@@ -0,0 +1,334 @@
+cmds/_
+cmds/abbr
+cmds/alias
+cmds/and
+cmds/argparse
+cmds/begin
+cmds/bg
+cmds/bind
+cmds/block
+cmds/break
+cmds/breakpoint
+cmds/builtin
+cmds/case
+cmds/cd
+cmds/cdh
+cmds/command
+cmds/commandline
+cmds/complete
+cmds/contains
+cmds/continue
+cmds/count
+cmds/dirh
+cmds/dirs
+cmds/disown
+cmds/echo
+cmds/else
+cmds/emit
+cmds/end
+cmds/eval
+cmds/exec
+cmds/exit
+cmds/export
+cmds/false
+cmds/fg
+cmds/fish
+cmds/fish_add_path
+cmds/fish_breakpoint_prompt
+cmds/fish_clipboard_copy
+cmds/fish_clipboard_paste
+cmds/fish_command_not_found
+cmds/fish_config
+cmds/fish_default_key_bindings
+cmds/fish_delta
+cmds/fish_git_prompt
+cmds/fish_greeting
+cmds/fish_hg_prompt
+cmds/fish_indent
+cmds/fish_is_root_user
+cmds/fish_key_reader
+cmds/fish_mode_prompt
+cmds/fish_opt
+cmds/fish_prompt
+cmds/fish_right_prompt
+cmds/fish_should_add_to_history
+cmds/fish_status_to_signal
+cmds/fish_svn_prompt
+cmds/fish_tab_title
+cmds/fish_title
+cmds/fish_title.inc
+cmds/fish_update_completions
+cmds/fish_vcs_prompt
+cmds/fish_vi_key_bindings
+cmds/for
+cmds/funced
+cmds/funcsave
+cmds/function
+cmds/functions
+cmds/help
+cmds/history
+cmds/if
+cmds/isatty
+cmds/jobs
+cmds/math
+cmds/nextd
+cmds/not
+cmds/open
+cmds/or
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+cmds/popd
+cmds/prevd
+cmds/printf
+cmds/prompt_hostname
+cmds/prompt_login
+cmds/prompt_pwd
+cmds/psub
+cmds/pushd
+cmds/pwd
+cmds/random
+cmds/read
+cmds/realpath
+cmds/return
+cmds/set
+cmds/set_color
+cmds/source
+cmds/status
+cmds/string
+cmds/string-collect
+cmds/string-escape
+cmds/string-join
+cmds/string-join0
+cmds/string-length
+cmds/string-lower
+cmds/string-match
+cmds/string-pad
+cmds/string-repeat
+cmds/string-replace
+cmds/string-shorten
+cmds/string-split
+cmds/string-split0
+cmds/string-sub
+cmds/string-trim
+cmds/string-unescape
+cmds/string-upper
+cmds/suspend
+cmds/switch
+cmds/test
+cmds/time
+cmds/trap
+cmds/true
+cmds/type
+cmds/ulimit
+cmds/umask
+cmds/vared
+cmds/wait
+cmds/while
+commands
+commands#helper-commands
+commands#helper-functions
+commands#keywords
+commands#known-functions
+commands#the-full-list
+commands#tools
+completions
+completions#useful-functions-for-writing-completions
+completions#where-to-put-completions
+contributing
+contributing#adding-translations-for-a-new-language
+contributing#code-style
+contributing#configuring-your-editor-for-fish-scripts
+contributing#contributing-completions
+contributing#contributing-documentation
+contributing#contributing-translations
+contributing#editing-po-files
+contributing#fish-script-style-guide
+contributing#github
+contributing#guidelines
+contributing#local-testing
+contributing#mailing-list
+contributing#minimum-supported-rust-version-msrv-policy
+contributing#modifications-to-strings-in-source-files
+contributing#modifying-existing-translations
+contributing#setting-code-up-for-translations
+contributing#testing
+contributing#updating-dependencies
+contributing#versioning
+design
+design#configurability-is-the-root-of-all-evil
+design#the-law-of-discoverability
+design#the-law-of-orthogonality
+design#the-law-of-responsiveness
+design#the-law-of-user-focus
+faq
+faq#fish-does-not-work-in-a-specific-terminal
+faq#how-do-i-change-the-greeting-message
+faq#how-do-i-check-whether-a-variable-is-defined
+faq#how-do-i-check-whether-a-variable-is-not-empty
+faq#how-do-i-customize-my-syntax-highlighting-colors
+faq#how-do-i-get-the-exit-status-of-a-command
+faq#how-do-i-run-a-command-every-login-what-s-fish-s-equivalent-to-bashrc-or-profile
+faq#how-do-i-run-a-command-from-history
+faq#how-do-i-run-a-subcommand-the-backtick-doesn-t-work
+faq#how-do-i-set-my-prompt
+faq#how-do-i-set-or-clear-an-environment-variable
+faq#i-m-getting-weird-graphical-glitches-a-staircase-effect-ghost-characters-cursor-in-the-wrong-position
+faq#my-command-pkg-config-gives-its-output-as-a-single-long-string
+faq#my-command-prints-no-matches-for-wildcard-but-works-in-bash
+faq#uninstalling-fish
+faq#what-is-the-equivalent-to-this-thing-from-bash-or-other-shells
+faq#why-does-my-prompt-show-a-i
+faq#why-doesn-t-history-substitution-etc-work
+faq#why-doesn-t-set-ux-exported-universal-variables-seem-to-work
+faq#why-won-t-ssh-scp-rsync-connect-properly-when-fish-is-my-login-shell
+fish_for_bash_users
+fish_for_bash_users#arithmetic-expansion
+fish_for_bash_users#blocks-and-loops
+fish_for_bash_users#builtins-and-other-commands
+fish_for_bash_users#command-substitutions
+fish_for_bash_users#heredocs
+fish_for_bash_users#other-facilities
+fish_for_bash_users#process-substitution
+fish_for_bash_users#prompts
+fish_for_bash_users#quoting
+fish_for_bash_users#special-variables
+fish_for_bash_users#string-manipulation
+fish_for_bash_users#subshells
+fish_for_bash_users#test-test
+fish_for_bash_users#variables
+fish_for_bash_users#wildcards-globs
+index
+index#configuration
+index#default-shell
+index#examples
+index#installation
+index#other-help-pages
+index#resources
+index#setup
+index#shebang-line
+index#starting-and-exiting
+index#uninstalling
+index#where-to-go
+interactive
+interactive#abbreviations
+interactive#autosuggestions
+interactive#command-line-editor
+interactive#command-mode
+interactive#configurable-greeting
+interactive#copy-and-paste-kill-ring
+interactive#custom-bindings
+interactive#directory-stack
+interactive#emacs-mode-commands
+interactive#help
+interactive#insert-mode
+interactive#key-sequences
+interactive#multiline-editing
+interactive#navigating-directories
+interactive#pager-color-variables
+interactive#private-mode
+interactive#programmable-prompt
+interactive#programmable-title
+interactive#searchable-command-history
+interactive#shared-bindings
+interactive#syntax-highlighting
+interactive#syntax-highlighting-variables
+interactive#tab-completion
+interactive#vi-mode-commands
+interactive#visual-mode
+language
+language#argument-handling
+language#autoloading-functions
+language#brace-expansion
+language#builtin-commands
+language#combiners-and-or
+language#combining-different-expansions
+language#combining-lists
+language#combining-pipes-and-redirections
+language#command-lookup
+language#command-substitution
+language#comments
+language#conditions
+language#configuration-files
+language#debugging-fish-scripts
+language#defining-aliases
+language#dereferencing-variables
+language#escaping-characters
+language#event-handlers
+language#exporting-variables
+language#functions
+language#future-feature-flags
+language#home-directory-expansion
+language#input-output-redirection
+language#job-control
+language#lists
+language#locale-variables
+language#loops-and-blocks
+language#overriding-variables-for-a-single-command
+language#parameter-expansion
+language#path-variables
+language#piping
+language#profiling-fish-scripts
+language#querying-for-user-input
+language#quotes
+language#quoting-variables
+language#shell-variable-and-function-names
+language#shell-variables
+language#slices
+language#special-variables
+language#syntax-overview
+language#table-of-operators
+language#terminology
+language#the-if-statement
+language#the-status-variable
+language#the-switch-statement
+language#universal-variables
+language#variable-expansion
+language#variable-scope
+language#variables-as-command
+language#wildcards-globbing
+license
+license#gnu-library-general-public-license
+license#license-for-fish
+license#license-for-the-python-docs-theme
+license#mit-license
+prompt
+prompt#adding-color
+prompt#formatting
+prompt#our-first-prompt
+prompt#save-the-prompt
+prompt#shortening-the-working-directory
+prompt#status
+prompt#transient-prompt
+prompt#where-to-go-from-here
+relnotes
+terminal-compatibility
+terminal-compatibility#dcs-commands-and-gnu-screen
+terminal-compatibility#optional-commands
+terminal-compatibility#required-commands
+terminal-compatibility#unicode-codepoints
+tutorial
+tutorial#autoloading-functions
+tutorial#autosuggestions
+tutorial#combiners-and-or-not
+tutorial#command-substitutions
+tutorial#conditionals-if-else-switch
+tutorial#exit-status
+tutorial#exports-shell-variables
+tutorial#functions
+tutorial#getting-help
+tutorial#getting-started
+tutorial#learning-fish
+tutorial#lists
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+tutorial#path
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+tutorial#ready-for-more
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+tutorial#separating-commands-semicolon
+tutorial#startup-where-s-bashrc
+tutorial#syntax-highlighting
+tutorial#tab-completions
+tutorial#universal-variables
+tutorial#variables
+tutorial#why-fish
+tutorial#wildcards