Remove no longer applicable Flask project notice in LICENSE
Remove no longer applicable Flask project notice in LICENSE

jupytercalpoly/jupyter-alabaster-theme,ellisonbg/jupyter-alabaster-theme,nikolas/alabaster,bgeron/alabaster,ellisonbg/jupyter-alabaster-theme,charnpreetsingh/jupyter-alabaster-theme,nikolas/alabaster,jupytercalpoly/jupyter-alabaster-theme,charnpreetsingh/jupyter-alabaster-theme,charnpreetsingh/jupyter-alabaster-theme,ellisonbg/jupyter-alabaster-theme,bgeron/alabaster,jupytercalpoly/jupyter-alabaster-theme