* use PyPA build package to produce wheels
* update the Makefile and install_pytrexio to use PyPA build package
* remove MacOS-11 from runners
* [MacOS] portable expression for FreeBSD sed
* disable usage of NUMPY_INCLUDEDIR env variable
* activate PyPI upload and disable TestPyPI
* working static html doc website generated from org-mode files
* fix build_doc script
* add gitignore
* add gitignore
* clean html garbage
* documented hdf5
* documented text back end