Change Python version to 3.13, update pdoc footer, and enable theme toggle

Updated Python version and modified pdoc command.

Author: alexplaka

.github/workflows/docs.yml

@@ -18,15 +18,15 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.12'
+          python-version: '3.13'
 
       - run: |
           python -m pip install --upgrade pip
           pip install uv
           uv pip install -r pyproject.toml --system --all-extras
 
-      - run: pdoc --docformat numpy --math --footer-text "© Copyright 2024-2025, Alex Plakantonakis." abstochkin -o ./docs
+      - run: pdoc --docformat numpy --math --footer-text "© Copyright 2024-2026, Alex Plakantonakis." --theme-toggle abstochkin -o ./docs
 
       - uses: actions/upload-pages-artifact@v3
         with:
-          path: docs/
+          path: docs/