less: set menu colors - navbar and dropdown hover and active color This is especially important in navbar when @kallithea-theme-inverse-color isn't white. To try to keep the contrast and make it more visible what is highlighted, give it 15% tint like the background. The same colors are used for selected items in dropdown menus.

# requirements.txt file for use as "pip install -r requirements.txt" as a
# readthedocs compatible alternative to "pip install -e ." which is a working
# alternative to "setup.py develop" which doesn't work with Mercurial 3.7
.