Run sphinx directly on readthedocs (#1919)

* Run sphinx directly on readthedocs

* Update doc build script

Author: dstansby

.readthedocs.yaml

@@ -1,15 +1,19 @@
 version: 2
 
 build:
-  os: ubuntu-20.04
+  os: ubuntu-22.04
   tools:
     python: "3.10"
-  commands:
-    - pip install hatch
-    - hatch run docs:rtd
 
 sphinx:
   configuration: docs/conf.py
   fail_on_warning: true
 
 formats: all
+
+python:
+   install:
+   - method: pip
+     path: .
+     extra_requirements:
+        - docs

pyproject.toml

@@ -136,8 +136,7 @@ list-env = "pip list"
 features = ['docs']
 
 [tool.hatch.envs.docs.scripts]
-build = "sphinx-build docs/ docs/_build/"
-rtd = "sphinx-build docs/ _readthedocs/html/"
+build = "cd docs && make html"
 serve = "sphinx-autobuild docs docs/_build --ignore 'docs/_autoapi/**/*' --host 0.0.0.0"
 
 [tool.ruff]