docs: use different docs theme, update docs and examples, and improve docs build

.readthedocs.yaml

@@ -1,20 +1,18 @@
 # .readthedocs.yaml
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-# Required
 version: 2
 
 # Set the version of Python and other tools you might need
 build:
   os: ubuntu-20.04
-  tools:
-    python: "3.9"
+  tools: { python: "3.11" }
+  jobs:
+    pre_create_environment:
+      - asdf plugin add poetry
+      - asdf install poetry latest
+      - asdf global poetry latest
+      - poetry config virtualenvs.create false
+    post_install:
+      - VIRTUAL_ENV=$READTHEDOCS_VIRTUALENV_PATH poetry install --only docs
 
 mkdocs:
-  configuration: mkdocs.yml
-
-# Optionally declare the Python requirements required to build your docs
-python:
-   install:
-   - requirements: docs/requirements.txt
+  configuration: mkdocs.yml