Add chapter numbers to Jupyter Book

LICENSE

@@ -1,29 +1,45 @@
-BSD 3-Clause License
-
-Copyright (c) 2020, PSLmodels/Git-Tutorial contributors
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-1. Redistributions of source code must retain the above copyright notice, this
-   list of conditions and the following disclaimer.
-
-2. Redistributions in binary form must reproduce the above copyright notice,
-   this list of conditions and the following disclaimer in the documentation
-   and/or other materials provided with the distribution.
-
-3. Neither the name of the copyright holder nor the names of its contributors
-   may be used to endorse or promote products derived from this software
-   without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
+
+Copyright (c) 2026, PSLmodels/Git-Tutorial contributors
+
+This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License ("CC BY-NC-SA 4.0").
+
+Plain-English summary
+=====================
+
+You may:
+
+* copy and share this material in any medium or format
+* adapt, remix, transform, and build on this material
+
+These permissions apply only if your use is non-commercial and you follow the license terms below.
+
+You must:
+
+* give appropriate attribution to PSLmodels/Git-Tutorial contributors
+* include a copyright notice
+* provide a link to the CC BY-NC-SA 4.0 license
+* indicate whether you made changes
+* distribute adaptations under the same CC BY-NC-SA 4.0 license or a Creative Commons compatible license
+
+You may not:
+
+* use this material for commercial purposes
+* apply additional legal or technical restrictions that would limit other people from exercising the rights granted by the license
+* imply that the licensors endorse you or your use of the material unless they have explicitly agreed to do so
+
+Additional notes
+================
+
+* This summary is provided for convenience and does not replace the full license.
+* Some uses may still require additional permissions if other rights are involved, such as privacy, publicity, or third-party rights.
+* Exceptions and limitations to copyright law, such as fair use, are not affected by this license.
+
+To view a copy of this license, visit:
+https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+Or send a letter to:
+Creative Commons
+PO Box 1866
+Mountain View, CA 94042
+USA

book/content/appendix/index.md

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+# Appendix
+
+This appendix collects reference material that supports the main tutorial.
+
+It currently includes the glossary.

book/content/background/index.md

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+# Git and GitHub Background and History
+
+This part of the book provides background on version control, Git, GitHub, and the broader collaboration context that made these tools so important.
+
+The chapters in this section explain where Git came from, how GitHub grew into a dominant collaboration platform, and why Git-based workflows differ from simpler shared-document systems such as Google Docs or Dropbox.

book/content/intro.md

@@ -1,3 +1,7 @@
+---
+numbering: false
+---
+
 (chap_intro)=
 # Git and GitHub Tutorial Introduction
 

book/content/repomgt/index.md

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+# Open Source Repository Management
+
+This part of the book covers the repository-level practices that make collaboration more reliable and sustainable.
+
+The chapters in this section discuss licensing, continuous integration, documentation, and virtual environments, all of which help a shared project stay usable for both maintainers and new contributors.

book/content/repomgt/license.md

@@ -3,6 +3,16 @@
 
 Choosing a license is one of the most important early decisions for an open-source repository. A license tells other people what they are allowed to do with the code and what obligations come with that use.
 
+## License used by this project
+
+The Git Tutorial project is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license (CC BY-NC-SA 4.0).
+
+The copyright notice for the project should read:
+
+`Copyright (c) 2026, PSLmodels/Git-Tutorial contributors`
+
+This is a more restrictive license than permissive software licenses such as BSD or MIT because it requires attribution, limits use to non-commercial purposes, and requires adapted versions to be shared under the same license terms.
+
 ## Why a license matters
 
 Without a license, a public GitHub repository may be visible, but others usually do not have clear legal permission to reuse, modify, or redistribute the code.
@@ -28,6 +38,10 @@ These licenses are often chosen when the project wants to maximize downstream ad
 
 Copyleft licenses such as GPL require derivative works to remain under compatible open-source terms when distributed. These licenses are often chosen when maintainers want changes to remain open in downstream redistributions.
 
+### Creative Commons licenses
+
+Creative Commons licenses are more commonly used for documentation, books, and other written or creative works than for software source code. A license such as CC BY-NC-SA 4.0 allows sharing and adaptation with attribution, restricts commercial use, and requires derivatives to use the same license.
+
 ## Questions maintainers should ask
 
 Before choosing a license, it helps to ask:

book/content/txteditor/index.md

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+# Text Editor Git Configuration
+
+This part of the book looks at how text editors can support a Git-based workflow without replacing the underlying Git concepts.
+
+The chapters in this section provide an overview of editor integration and a more detailed walkthrough for Visual Studio Code.

book/content/using/index.md

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+# Using Git and GitHub
+
+This part of the book focuses on the practical workflow a contributor follows when using Git and GitHub.
+
+The chapters in this section cover installation, configuration, account setup, basic terminology, collaborative workflow, merge conflicts, pull requests, attribution, advanced workflow topics, and a short command reference.

book/myst.yml

@@ -10,14 +10,16 @@ project:
   github: PSLmodels/Git-Tutorial
   bibliography:
     - _bibliography/references.bib
+  numbering:
+    title: true
   toc:
     - file: content/intro.md
-    - title: Git and GitHub Background and History
+    - file: content/background/index.md
       children:
         - file: content/background/VCgitHistory.md
         - file: content/background/GitHubHistory.md
         - file: content/background/GoogleDropboxBox.md
-    - title: Using Git and GitHub
+    - file: content/using/index.md
       children:
         - file: content/using/installing_git.md
         - file: content/using/git_config.md
@@ -29,17 +31,17 @@ project:
         - file: content/using/Attribution.md
         - file: content/using/AdvancedGit.md
         - file: content/using/GitCheatSheet.md
-    - title: Open Source Repository Management
+    - file: content/repomgt/index.md
       children:
         - file: content/repomgt/license.md
         - file: content/repomgt/testing_CI.md
         - file: content/repomgt/documentation.md
         - file: content/repomgt/virt_env.md
-    - title: Text Editor Git Configuration
+    - file: content/txteditor/index.md
       children:
         - file: content/txteditor/TextEditorsIntro.md
         - file: content/txteditor/VScode.md
-    - title: Appendix
+    - file: content/appendix/index.md
       children:
         - file: content/glossary.md