doc: Update for RTD settings

- Use dirhtml
- Adjust latest format

.readthedocs.yml

@@ -1,15 +1,20 @@
 version: 2
 
+build:
+  os: 'ubuntu-22.04'
+  tools:
+    python: '3.10'
+
 # Build documentation in the doc/ directory with Sphinx
 sphinx:
   configuration: doc/conf.py
+  builder: dirhtml
 
 # Optionally build your docs in additional formats such as PDF and ePub
 formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-  version: 3
   install:
     - method: pip
       path: .