docs: Move SPDX identifiers under first title

docs/CONTRIBUTING.md

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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Contributing
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## Submitting patches
 
 A majority of current maintainers prefer the GitHub pull request

docs/README-historical.md

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-title: Historical OSTree README
 ---
+
+# Historical OSTree README
+
 <!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 **This file is outdated, but some of the text here is still useful for
 historical context.  I'm preserving it (explicitly still in the tree)
 for posterity.**
 
-OSTree
-======
-
 Problem statement
 -----------------
 

docs/adapting-existing.md

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 nav_order: 70
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Adapting existing mainstream distributions
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## System layout
 
 First, OSTree encourages systems to implement

docs/atomic-rollbacks.md

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 nav_order: 60
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Atomic Rollbacks
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## Automatic rollbacks
 
 See [greenboot](https://github.com/fedora-iot/greenboot/blob/main/README.md) for information on automatic rollbacks and how to integrate

docs/atomic-upgrades.md

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 nav_order: 50
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Atomic Upgrades
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## You can turn off the power anytime you want...
 
 OSTree is designed to implement fully atomic and safe upgrades;

docs/authenticated-repos.md

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 nav_order: 100
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Handling access to authenticated remote repositories
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 There is no default concept of an "ostree server"; ostree expects to talk to a generic webserver, so any tool and technique applicable for generic HTTP can also apply to fetching content via OSTree's builtin HTTP client.
 
 ## Using mutual TLS

docs/bootloaders.md

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 nav_order: 120
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Bootloaders
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## OSTree and bootloaders
 
 The intended design of OSTree is that it just writes new files into `/boot/loader/entries`.  There is a legacy GRUB script (shipped on Fedora as `ostree-grub2`) that is intended only for the cases where the system GRUB does not support the `blscfg` verb.

docs/buildsystem-and-repos.md

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 nav_order: 90
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Writing a buildsystem and managing repositories
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 OSTree is not a package system.  It does not directly support building
 source code.  Rather, it is a tool for transporting and managing
 content, along with package-system independent aspects like bootloader

docs/composefs.md

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 nav_order: 110
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Using composefs with OSTree
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## composefs
 
 The [composefs](https://github.com/containers/composefs) project is a new

docs/contributing-tutorial.md

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 nav_order: 200
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # OSTree Contributing Tutorial
 {: .no_toc }
@@ -11,6 +10,8 @@ The following guide is about OSTree forking, building, adding a command, testing
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## Getting Started
 
 Fork https://github.com/ostreedev/ostree, then run the following commands.

docs/deployment.md

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 nav_order: 40
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Deployments
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## Overview
 
 Built on top of the OSTree versioning filesystem core is a layer

docs/formats.md

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 nav_order: 80
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # OSTree data formats
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## On the topic of "smart servers"
 
 One really crucial difference between OSTree and git is that git has a

docs/ima.md

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 nav_order: 110
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Using Linux IMA with OSTree
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## Linux IMA
 
 The [Linux Integrity Measurement Architecture](https://sourceforge.net/p/linux-ima/wiki/Home/)

docs/index.md

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 nav_order: 10
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # libostree
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 This project is now known as "libostree", though it is still appropriate to use
 the previous name: "OSTree" (or "ostree"). The focus is on projects which use
 libostree's shared library, rather than users directly invoking the command line

docs/introduction.md

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 nav_order: 20
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # OSTree Overview
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## Introduction
 
 OSTree is an upgrade system for Linux-based operating systems that

docs/related-projects.md

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 nav_order: 110
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Related Projects
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 OSTree is in many ways very evolutionary.  It builds on concepts and
 ideas introduced from many different projects such as
 [Systemd Stateless](http://0pointer.net/blog/projects/stateless.html),

docs/repo.md

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 nav_order: 30
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Anatomy of an OSTree repository
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## Core object types and data model
 
 OSTree is deeply inspired by git; the core layer is a userspace

docs/repository-management.md

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 nav_order: 100
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # Managing content in OSTree repositories
 {: .no_toc }
 
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 Once you have a build system going, if you actually want client
 systems to retrieve the content, you will quickly feel a need for
 "repository management".

docs/var.md

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 nav_order: 70
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-<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
 
 # OSTree and /var handling
 
@@ -10,6 +9,8 @@ nav_order: 70
 1. TOC
 {:toc}
 
+<!-- SPDX-License-Identifier: (CC-BY-SA-3.0 OR GFDL-1.3-or-later) -->
+
 ## Default commit/image /var handling
 
 As of OSTree 2024.3, when a commit is "deployed" (queued to boot),