Upgrade to more recent versions

- using python 3.9.7 and dependencies as from current anaconda
  (which is used for teaching)

Author: fangohr

book/_config.yml

@@ -38,7 +38,21 @@ html:
 
 # Allow parsing of "<img src=..." tags in markdown cells (used in Chapter 15 on visualisation)
 parse:
-  myst_extended_syntax: true
+  myst_enable_extensions:  # default extensions to enable in the myst parser. See https://myst-parser.readthedocs.io/en/latest/using/syntax-optional.html
+    # - amsmath
+    - colon_fence
+    # - deflist
+    - dollarmath
+    # - html_admonition
+    - html_image
+    # - linkify
+    # - replacements
+    # - smartquotes
+    - substitution
+    - tasklist
+  myst_url_schemes: [mailto, http, https] # URI schemes that will be recognised as external URLs in Markdown links
+  # myst_dmath_double_inline: true  # Allow display math ($$) within an inline context
+
 
 
 sphinx:

book/_toc.yml

@@ -1,9 +1,8 @@
-# Table of content
-# Learn more at https://jupyterbook.org/customize/toc.html
-#
-- file: opening
+format: jb-article
+root: opening
+options:
   numbered: true
-
+sections:
 - file: 01-introduction
 - file: 02-powerful-calculator
 - file: 03-data-types-structures