Fix Sphinx build and add workflow for Sphinx website

.github/workflows/docs.yml

@@ -0,0 +1,58 @@
+name: Docs
+
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build-docs:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install docs dependencies
+        run: |
+          python -m pip install -U pip
+          python -m pip install -r docs/requirements.txt
+
+      - name: Build Sphinx docs
+        run: |
+          python -m sphinx -b html -W --keep-going docs docs/_build/html
+          touch docs/_build/html/.nojekyll
+
+      - name: Upload Pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: docs/_build/html
+
+  deploy:
+    if: github.event_name == 'push'
+    needs: build-docs
+    runs-on: ubuntu-latest
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

@@ -27,8 +27,6 @@ share/python-wheels/
 MANIFEST
 
 # PyInstaller
-#  Usually these files are written by a python script from a template
-#  before PyInstaller builds the exe, so as to inject date/other infos into it.
 *.manifest
 *.spec
 
@@ -69,7 +67,16 @@ instance/
 .scrapy
 
 # Sphinx documentation
-docs/_build/
+# Keep source files in docs/ tracked, but ignore generated build output.
+/docs/_build/
+/docs/.doctrees/
+/docs/_autosummary/
+/docs/linkcheck/
+
+# Legacy Sphinx output locations, in case older commands are used.
+/doc/_build/
+/doc/build/html/
+/doc/build/doctrees/
 
 # PyBuilder
 .pybuilder/
@@ -83,35 +90,20 @@ profile_default/
 ipython_config.py
 
 # pyenv
-#   For a library or package, you might want to ignore these files since the code is
-#   intended to run in multiple environments; otherwise, check them in:
 # .python-version
 
 # pipenv
-#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
-#   However, in case of collaboration, if having platform-specific dependencies or dependencies
-#   having no cross-platform support, pipenv may install dependencies that don't work, or not
-#   install all needed dependencies.
-#Pipfile.lock
+# Pipfile.lock
 
 # poetry
-#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
-#   This is especially recommended for binary packages to ensure reproducibility, and is more
-#   commonly ignored for libraries.
-#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
-#poetry.lock
+# poetry.lock
 
 # pdm
-#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
-#pdm.lock
-#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
-#   in version control.
-#   https://pdm.fming.dev/latest/usage/project/#working-with-version-control
 .pdm.toml
 .pdm-python
 .pdm-build/
 
-# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+# PEP 582
 __pypackages__/
 
 # Celery stuff
@@ -155,10 +147,6 @@ dmypy.json
 cython_debug/
 
 # PyCharm
-#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
-#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
-#  and can be added to the global gitignore or merged into this file.  For a more nuclear
-#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 .idea/
 
 # MacOS