[patch] Update readthedocs config (#15)

Bumping some versions, adding the versioneer[toml] install and build isolation, and removing other install directions

.readthedocs.yml

@@ -6,9 +6,13 @@
 version: 2
 
 build:
-   os: ubuntu-20.04
-   tools:
-     python: 'mambaforge-4.10'
+  os: "ubuntu-22.04"
+  tools:
+    python: "mambaforge-22.9"
+  jobs:
+    pre_build:
+      - pip install versioneer[toml]==0.29
+      - pip install . --no-deps --no-build-isolation
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
@@ -24,9 +28,3 @@ formats: all
 # Install pyiron from conda 
 conda:
   environment: docs/environment.yml
-
-# Optionally set the version of Python and requirements required to build your docs
-python:
-  install:
-    - method: pip
-      path: .