change to rtd theme

.readthedocs.yml

@@ -0,0 +1,25 @@
+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
+# Build documentation in the doc/ directory with Sphinx
+sphinx:
+  configuration: doc/conf.py
+
+# Optionally build your docs in additional formats such as PDF and ePub
+formats: all
+
+# Optionally set the version of Python and requirements required to build your docs
+python:
+  install:
+    - requirements: doc/requirements.txt
+    - method: pip
+      path: .

doc/conf.py

@@ -101,7 +101,7 @@
 # html_theme = 'nature'
 # Use default rather than my normal nature so we get the read-the-docs style on
 # that website.
-html_theme = 'default'
+html_theme = 'sphinx_rtd_theme'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the

doc/requirements.txt

@@ -0,0 +1,3 @@
+docutils!=0.18
+    # There is an incompatibility between Sphinx and docutils version 0.18.
+sphinx_rtd_theme