docs: READTHEDOCS build support removed

docs/conf.py

@@ -121,29 +121,9 @@ html_css_files = ["css/custom.css"]
 # -- Breathe configuration ---------------------------------------------------
 
 
-def configureDoxyfile(input_dir, output_dir):
-    with open("Doxyfile.in", "r") as file:
-        filedata = file.read()
-
-    filedata = filedata.replace("@DOXYGEN_INPUT_DIR@", input_dir)
-    filedata = filedata.replace("@DOXYGEN_OUTPUT_DIR@", output_dir)
-
-    with open("Doxyfile", "w") as file:
-        file.write(filedata)
-
-
-# Check if we're running on Read the Docs' servers
-read_the_docs_build = os.environ.get("READTHEDOCS", None) == "True"
-
 # This should be a dictionary in which the keys are project names and the values
 # are paths to the folder containing the doxygen output for that project.
-breathe_projects = {}
-if read_the_docs_build:
-    input_dir = "../src"
-    output_dir = "build"
-    configureDoxyfile(input_dir, output_dir)
-    subprocess.call("doxygen", shell=True)
-    breathe_projects["mp-units"] = output_dir + "/xml"
+breathe_projects = {"mp-units": "build/xml"}
 
 # This should match one of the keys in the breathe_projects dictionary and
 # indicates which project should be used when the project is not specified on