Update build to modern Python environments and latest RTD theme

Author: pspanja

.readthedocs.yml

@@ -1,8 +1,8 @@
 version: 2
 build:
-    os: "ubuntu-22.04"
+    os: "ubuntu-24.04"
     tools:
-        python: "3.11"
+        python: "3"
 sphinx:
     configuration: docs/conf.py
 python:

docs/conf.py

@@ -20,8 +20,7 @@
     'sphinx.ext.todo',
     'sphinx.ext.coverage',
     'sphinx.ext.imgmath',
-    'sphinx.ext.ifconfig',
-    'sensio.sphinx.configurationblock']
+    'sphinx.ext.ifconfig']
 
 source_suffix = '.rst'
 master_doc = 'index'
@@ -33,23 +32,19 @@
 version = ''
 release = ''
 
-exclude_patterns = ['_build', '.virtualenvs']
+exclude_patterns = ['_build', '.virtualenv']
 
 html_theme = "sphinx_rtd_theme"
-html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
 html_static_path = ['_static']
 templates_path = ['_templates']
 
 html_theme_options = {
     'collapse_navigation': True,
-    'display_version': True,
+    'version_selector': True,
 }
 
 html_context = {
     'copyright_url': 'https://netgen.io',
     'current_year': datetime.utcnow().year
 }
-
-def setup(app):
-    app.add_stylesheet("css/style.css")

docs/requirements.txt

@@ -1,6 +1 @@
-setuptools>=65
-sphinx>=1.7.4,<2.0
-sphinx_rtd_theme>=0.3.1,<1.0
-git+https://github.com/fabpot/sphinx-php.git
-jinja2<3.1.0
-alabaster<0.7.14
+sphinx_rtd_theme>=3.1,<4.0