How to install build the help documentation?

1) Create Python virtual environment
	python3 -m venv help-venv

2) Activate virtual environment
	source help-venv/bin/activate 

3) Install the required Python packages to build the documentation 
	pip3 install -r requirements.txt
	
4) Build docs
	cd ~/git/qucs-s-spar-viewer/docs/help/source
	chmod +x build_docs
	./build_docs
