docs: add labels to all pages

docs/explanation/faq.md

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+(chise_faq)=
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 # FAQ
 
 This page lists some known limitations and frequently asked questions.

docs/how-to/install-chisel.md

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+(install_chisel)=
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 # How to install Chisel
 
 To install the latest version of Chisel, you can choose any of the following

docs/how-to/slice-a-package.md

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+(slice_package)=
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 # Slice a package
 
 This guide provides instructions on the slicing of an Ubuntu package for

docs/how-to/use-chisel-in-dockerfile.md

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+(use_chisel_dockerfile)=
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 # Use Chisel in a Dockerfile
 
 Chiseled file systems are ideal for creating minimal and distroless-like

docs/reference/cmd/find.md

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+(find_command_reference)=
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 # find command
 
 The **find** command queries {{chisel_releases_repo}} for matching slices.

docs/reference/cmd/help.md

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+(help_command_reference)=
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 # help command
 
 The **help** command displays information about commands.

docs/reference/cmd/index.md

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+(command_reference)=
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 # CLI Commands
 
 Chisel uses subcommands, and is invoked using `chisel <command>`.

docs/reference/cmd/info.md

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+(info_command_reference)=
+
 # info command
 
 The **info** command shows detailed information about package slices.

docs/reference/cmd/version.md

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+(version_command_reference)=
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 # version command
 
 The **version** command displays the Chisel version and exits.

docs/tutorial/getting-started.md

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+(chisel_helloworld_tutorial)=
+
 # Getting started with Chisel
 
 This tutorial will walk you through the creation of your first