docs: remove forced install of ansys sphinx-autoapi fork

 - The fork stopped updating at 3.0.0, which is incompatible with latest
   autoapi versions.

Author: femarchi

doc/Makefile

@@ -13,13 +13,6 @@ help:
 
 .PHONY: help Makefile
 
-.install-deps:
-	@pip freeze | grep -q "sphinx-autoapi @ git+https://github.com/ansys/sphinx-autoapi" && is_custom_sphinx_autoapi_installed="yes" || is_custom_sphinx_autoapi_installed="no"
-	@if [ "$$is_custom_sphinx_autoapi_installed" != "yes" ]; then \
-		pip uninstall --yes sphinx-autoapi; \
-		pip install "sphinx-autoapi @ git+https://github.com/ansys/sphinx-autoapi@feat/single-page-stable"; \
-	fi
-
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
 %: Makefile

doc/make.bat

@@ -10,13 +10,6 @@ if "%SPHINXBUILD%" == "" (
 set SOURCEDIR=source
 set BUILDDIR=_build
 
-REM TODO: these lines of code should be removed once the feature branch is merged
-for /f %%i in ('pip freeze ^| findstr /c:"sphinx-autoapi @ git+https://github.com/ansys/sphinx-autoapi"') do set is_custom_sphinx_autoapi_installed=%%i
-if NOT "%is_custom_sphinx_autoapi_installed%" == "sphinx-autoapi" (
-	pip uninstall --yes sphinx-autoapi
-	pip install "sphinx-autoapi @ git+https://github.com/ansys/sphinx-autoapi@feat/single-page-stable")
-REM TODO: these lines of code should be removed once the feature branch is merged
-
 if "%1" == "" goto help
 if "%1" == "clean" goto clean
 if "%1" == "pdf" goto pdf