Add a little more detail in the RTD yaml config [decent_ci_skip] [act…

…ions skip]

.readthedocs.yml

@@ -2,9 +2,18 @@ version: 2
 
 sphinx:
   configuration: doc/readthedocs/sphinx/conf.py
+  builder: html
+
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+  apt_packages:
+    - doxygen
 
-# read the docs image build already includes sphinx-rtd-theme, so this isn't needed
-# however, keeping it here and running it on RTD is a near zero cost operation and makes sure the requirements are ok
 python:
   install:
     - requirements: doc/readthedocs/requirements.txt
+
+submodules:
+  exclude: all