Update .readthedocs.yaml

added formats, requirements and general updates

.readthedocs.yaml

@@ -9,14 +9,22 @@ version: 0.2.1
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.9"
-
+    python: "3.11"
+      
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
   configuration: docs/conf.py
+  fail_on_warning: true
+
+formats:
+  - pdf
+  - epub
 
 # We recommend specifying your dependencies to enable reproducible builds:
 # https://docs.readthedocs.io/en/stable/guides/reproducible-builds.html
-# python:
-#   install:
-#   - requirements: docs/requirements.txt
+python:
+   install:
+   - requirements: requirements.txt
+   # Install pygbif before building the docs
+   - method: pip
+     path: .