Don't try to build pdf and esoteric docs for read the docs, just html.

.readthedocs.yml

@@ -3,10 +3,9 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.10"
-    rust: "1.64"
+    rust: "1.70"
 sphinx:
   configuration: docs/conf.py
-formats: all
 python:
   install:
     - requirements: docs/requirements.txt