Fix docs dependency installation

Author: Reason-Wang

.readthedocs.yaml

@@ -4,11 +4,9 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3.12"
+  commands:
+    - pip install -e .
+    - pip install -e ".[docs]"
 
 mkdocs:
   configuration: mkdocs.yml
-
-python:
-  install:
-    - requirements: src/agentfly/requirements.txt
-    - requirements: docs/requirements-docs.txt