Update readthedocs setup

.readthedocs.yaml

@@ -17,8 +17,7 @@ python:
   install:
     - method: pip
       path: .
-      extra_requirements:
-        - docs
+    - requirements: docs/requirements.txt
 
 submodules:
   include: all

docs/requirements.txt

@@ -0,0 +1,3 @@
+mkdocs
+mkdocs-material
+mkdocstrings[python]

pyproject.toml

@@ -41,9 +41,4 @@ requires = [
     "cmake>=3.18",
     "ninja",
 ]
-build-backend = "setuptools.build_meta"
-
-[project.optional-dependencies]
-server = ["uvicorn", "fastapi", "sse-starlette"]
-test = ["pytest"]
-docs = ["mkdocs", "mkdocstrings[python]", "mkdocs-material"]
+build-backend = "setuptools.build_meta"