doc: use modern theme for html

next/conf.py

@@ -26,7 +26,7 @@
 # -- Options for HTML output -------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
 
-html_theme = 'alabaster'
+html_theme = 'sphinx_book_theme'
 html_static_path = ['_static']
 
 # -- Options for LaTeX output ------------------------------------------------

next/requirements.txt

@@ -1,5 +1,7 @@
+accessible-pygments==0.0.5
 alabaster==1.0.0
 babel==2.16.0
+beautifulsoup4==4.12.3
 certifi==2024.8.30
 charset-normalizer==3.4.0
 click==8.1.7
@@ -13,17 +15,21 @@ mdit-py-plugins==0.4.2
 mdurl==0.1.2
 myst-parser==4.0.0
 packaging==24.2
+pydata-sphinx-theme==0.16.0
 Pygments==2.18.0
 PyYAML==6.0.2
 requests==2.32.3
 setuptools==75.5.0
 snowballstemmer==2.2.0
+soupsieve==2.6
 Sphinx==8.1.3
+sphinx-book-theme==1.1.3
 sphinx-intl==2.3.0
 sphinxcontrib-applehelp==2.0.0
 sphinxcontrib-devhelp==2.0.0
 sphinxcontrib-htmlhelp==2.1.0
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==2.0.0
 sphinxcontrib-serializinghtml==2.0.0
+typing_extensions==4.12.2
 urllib3==2.2.3