use requirements.txt for readthedocs build.

.readthedocs.yaml

@@ -14,15 +14,6 @@ build:
     # nodejs: "19"
     # rust: "1.64"
     # golang: "1.19"
-  jobs:
-    pre_create_environment:
-      - asdf plugin add poetry
-      - asdf install poetry latest
-      - asdf global poetry latest
-      - poetry config virtualenvs.create false
-    post_install:
-      - cd docs
-      - poetry install
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
@@ -31,3 +22,8 @@ sphinx:
 # If using Sphinx, optionally build your docs in additional formats such as PDF
 # formats:
 #    - pdf
+
+# Optionally declare the Python requirements required to build your docs
+python:
+   install:
+   - requirements: docs/requirements.txt

docs/requirements.txt

@@ -0,0 +1,33 @@
+alabaster==0.7.13
+astroid==2.15.5
+Babel==2.12.1
+certifi==2023.5.7
+charset-normalizer==3.1.0
+docutils==0.18.1
+idna==3.4
+imagesize==1.4.1
+Jinja2==3.1.2
+lazy-object-proxy==1.9.0
+markdown-it-py==2.2.0
+MarkupSafe==2.1.2
+mdit-py-plugins==0.3.5
+mdurl==0.1.2
+myst-parser==1.0.0
+packaging==23.1
+Pygments==2.15.1
+PyYAML==6.0
+requests==2.30.0
+snowballstemmer==2.2.0
+Sphinx==6.2.1
+sphinx-autoapi==2.1.0
+sphinx-rtd-theme==1.2.0
+sphinxcontrib-applehelp==1.0.4
+sphinxcontrib-devhelp==1.0.2
+sphinxcontrib-htmlhelp==2.0.1
+sphinxcontrib-jquery==4.1
+sphinxcontrib-jsmath==1.0.1
+sphinxcontrib-qthelp==1.0.3
+sphinxcontrib-serializinghtml==1.1.5
+Unidecode==1.3.6
+urllib3==2.0.2
+wrapt==1.15.0