style: remove whitespace after icons Where the additional spacing is needed, we already have a padding-right, so these spaces are unnecessary. But more importantly they cause trouble if text-decoration is used (i.e. underline on hover).

# 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
.