Minor config tweaks.

_config.yml

@@ -9,6 +9,8 @@ description: This is the template book for everyone that wants to create a new J
 copyright: Delft University of Technology, CC BY-SA 4.0
 logo: content/images/tudelft.png
 exclude_patterns: [ _build, Thumbs.db, .DS_Store, "**.ipynb_checkpoints" ]
+
+# Only build files in the ToC to avoid building README, etc.
 only_build_toc_files: true
 
 
@@ -102,16 +104,17 @@ sphinx:
   recursive_update: false
 
   config:
+    language: en  # To identify the language. Change if appropriate
     html_js_files:
       - https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js
-      - https://cdn.jsdelivr.net/npm/loading-attribute-polyfill@2.1.0/dist/loading-attribute-polyfill.min.js
-      - https://cdn.jsdelivr.net/npm/loading-attribute-polyfill@2.1.0/dist/loading-attribute-polyfill.min.css
+#      - https://cdn.jsdelivr.net/npm/loading-attribute-polyfill@2.1.0/dist/loading-attribute-polyfill.min.js
+#      - https://cdn.jsdelivr.net/npm/loading-attribute-polyfill@2.1.0/dist/loading-attribute-polyfill.min.css
     mathjax3_config:
       loader: { load: [ '[tex]/autoload', '[tex]/ams' ] }
       tex:
         packages: { '[+]': [ 'autoload', 'ams', 'physics', 'boldsymbol' ] }
         tags: 'ams'
-        macros:
+        macros: # Define your macros here. Examples (note the use of escape \ for a backslash):
           "kB": "k_\\mathrm{B}"
           "bm": "\\mathbf"
           "inprod": "\\innerproduct"

intro.md

 # Open textbooks with Jupyter books
 
-This "How-To" Manual is meant as an explanation and working example of the possibilities of making an online open textbook with the Jupyter books software.
-
 Welcome to the Jupyter Book template for TU Delft! This template is designed to make it easy for professors to create their own custom textbooks, lecture notes, or other educational materials for their courses.
 
 With Jupyter Book, you can write your content using Markdown, Jupyter Notebooks, etc., and easily organize it into chapters and sections. You can also add interactive elements like code snippets, visualizations, and quizzes to engage your students and enhance their learning experience.
@@ -10,5 +8,3 @@ Whether you're creating a textbook from scratch or adapting existing materials,
 This collection of examples is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.
 
 <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" /></a>
-
-If you have any questions or feedback about the Jupyter Books manual, please don't hesitate to visit our contact page. We are always here to support you and are eager to hear your thoughts on how we can make this manual as helpful and user-friendly as possible. Thank you for using Jupyter Books to write your interactive book!