state: add __setitem__() for cmdstate class
Adding __setitem__() will help us in setting the value of variables stored in
state files using `state[key] = value` in our code which is very convenient.
mkdir -p html
cp index.html html/
cp *.css html/
cp *.js html/
cp -R img html/
cp -R graphviz-images/ html/
netlify deploy