Build online docs (RTD) with -W and dependencies

.readthedocs.yaml

@@ -4,7 +4,7 @@
 # Required
 version: 2
 
-# Set the OS, Python version and other tools you might need
+# Set the OS, Python version and other tools you might need.
 build:
   os: ubuntu-22.04
   tools:
@@ -14,22 +14,24 @@ build:
     # rust: "1.70"
     # golang: "1.20"
 
-# Build documentation in the "docs/" directory with Sphinx
+# Build documentation in the "doc/" directory with Sphinx.
 sphinx:
   configuration: doc/source/conf.py
   # You can configure Sphinx to use a different builder, for instance use the dirhtml builder for simpler URLs
   # builder: "dirhtml"
   # Fail on all warnings to avoid broken references
-  # fail_on_warning: true
+  fail_on_warning: true
 
-# Optionally build your docs in additional formats such as PDF and ePub
+# Optionally build your docs in additional formats such as PDF and ePub.
 # formats:
-#   - pdf
-#   - epub
+# - pdf
+# - epub
 
 # Optional but recommended, declare the Python requirements required
-# to build your documentation
+# to build your documentation.
 # See https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
-# python:
-#   install:
-#     - requirements: docs/requirements.txt
+python:
+  install:
+  - method: pip
+    path: .
+  - requirements: doc/requirements.txt

doc/source/conf.py

@@ -93,7 +93,7 @@
 # Options for HTML output
 # -----------------------
 
-# html_theme = "sphinx_rtd_theme"
+html_theme = "sphinx_rtd_theme"
 html_theme_options = {}
 
 # The name for this set of Sphinx documents.  If None, it defaults to