update the Documentation Development Guide

Author: jmckenna

en/development/documentation.txt

@@ -8,7 +8,7 @@
 :Contact: hobu.inc at gmail.com
 :Author:  Jeff McKenna
 :Contact: jmckenna at gatewaygeomatics.com
-:Last Updated: 2021-03-19
+:Last Updated: 2024-05-06
 
 .. contents:: Table of Contents
     :depth: 4
@@ -27,13 +27,13 @@ website is then automatically updated on each merged pull request.
 
 .. note::
 
-    The live website is actually built automatically on Travis CI, triggered by 
-    each commit to GitHub.  See the build history at https://travis-ci.com/github/MapServer/MapServer-documentation
+    The live website is actually built automatically through a `GitHub workflow <https://github.com/MapServer/MapServer-documentation/blob/main/.github/workflows/build.yml>`__, 
+    triggered by each push to the live branch.  See the `build history <https://github.com/MapServer/MapServer-documentation/actions/workflows/build.yml>`__.
 
 GitHub Notes
 ------------
 
-* Documentation files are stored in the /MapServer-documentation sub-project on GitHub at: https://github.com/MapServer/MapServer-documentation
+* Documentation files are stored in the `/MapServer-documentation` sub-project on GitHub at: https://github.com/MapServer/MapServer-documentation
 * Always submit pull requests to *main*, and if applicable your changes will be 
   backported to a specific branch
 * All files should have only *LF* as line feed.  Line feed (or 'linefeed') differences can 
@@ -153,8 +153,8 @@ Installing and Using Sphinx for rst-html Generation
 
 .. note::
 
-    As of 2021-03-19 the MapServer site requires at least Sphinx 3.5.0, 
-    alabaster 0.7.12, and the `sphinx-removed-in` extension - You can check 
+    As of 2024-05-06 the MapServer site requires at least Sphinx 7.3.0, 
+    alabaster 0.7.16, and the `sphinxcontrib-jquery` extension - You can check 
     the exact versions that the live website uses in the file 
     `requirements.txt <https://github.com/MapServer/MapServer-documentation/blob/main/requirements.txt/>`__, 
     (or you can instead browse the latest versions of the Sphinx packages `here <https://pypi.org/>`__)