doc: Change to use uv env

Author: attakei

.readthedocs.yaml

@@ -0,0 +1,13 @@
+version: 2
+
+build:
+  os: 'ubuntu-22.04'
+  tools:
+    python: '3.12'
+  commands:
+    - pip install uv
+    - uv sync --frozen
+    - uv run sphinx-build -b dirhtml docs $READTHEDOCS_OUTPUT/html
+
+# Optionally build your docs in additional formats such as PDF and ePub
+formats: []