Use Poetry properly with ReadTheDocs build jobs

- Remove requirements.txt approach
- Use post_create_environment to install Poetry
- Use post_install to install dependencies with Poetry
- This is the recommended approach for Poetry on ReadTheDocs

Author: joewandy

.readthedocs.yml

@@ -9,6 +9,15 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.11"
+  jobs:
+    post_create_environment:
+      # Install poetry
+      - pip install poetry
+      # Tell poetry to not use a virtual environment
+      - poetry config virtualenvs.create false
+    post_install:
+      # Install dependencies with Poetry
+      - poetry install --with dev
 
 # Build documentation with MkDocs
 mkdocs:
@@ -17,9 +26,3 @@ mkdocs:
 
 # Optionally build your docs in additional formats such as PDF and ePub
 formats: all
-
-python:
-  install:
-    - requirements: docs/requirements.txt
-    - method: pip
-      path: .