Add .readthedocs.yaml configuration file (#127)

Read the Docs now requires a .readthedocs.yaml config file at the
repository root. Also add sphinx-rtd-theme to docs dependencies so
the theme is properly installed during the build.

Co-authored-by: Adam Dobrawy <naczelnik@jawne.info.pl>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: 3 people

.readthedocs.yaml

@@ -0,0 +1,19 @@
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+version: 2
+
+build:
+  os: ubuntu-24.04
+  tools:
+    python: "3.12"
+
+sphinx:
+  configuration: docs/conf.py
+
+python:
+  install:
+    - method: pip
+      path: .
+      extra_requirements:
+        - docs

pyproject.toml

@@ -29,7 +29,7 @@ Homepage = "https://github.com/ad-m/python-anticaptcha"
 [project.optional-dependencies]
 async = ["httpx>=0.24"]
 tests = ["pytest", "retry", "selenium"]
-docs = ["sphinx"]
+docs = ["sphinx", "sphinx-rtd-theme"]
 
 [tool.setuptools.package-data]
 python_anticaptcha = ["py.typed"]