Sphinx API documentation framework (#11)

* initial loading of sphinx api documentation

* docker container and ci workflow

* pip install fix

* custom build command instead of github action

* another try..

* without docker

* check resulting file

* fix artifact path

* deploy only when pushed to main

* updating front page

* deploy only when pushed to main

* added references

* added a reference

* example comments on timing.py

* v2.0.0 tag

Update README.md

added instruction for LLNL LC Lassen users