Fixing API documentation for ReadTheDocs (#179)

* Test fixing API doc on ReadTheDocs

* Try fixing the doc by adding mock imports

* Cleanup Sphinx config file

Author: jlenain

docs/conf.py

@@ -83,9 +83,10 @@
 exclude_patterns = ["_build", "Thumbs.db", ".DS_Store"]
 
 autodoc_mock_imports = [
-    f"{project}.makers.calibration.core",
     f"{project}.makers.extractor.charge_extractor",
     f"{project}.dqm.bokeh_app",
+    "iminuit",
+    "matplotlib",
 ]
 
 # intersphinx allows referencing other packages sphinx docs