less: remove borders and padding around navbar items Navbar items were styled with borders to look like embossed areas that could be clicked. The top menu also had it in the drop-down menu, while the context menu didn't. The areas are big, and it is quite clear it is some kind of clickable menu ... and the clickable area is also highlighted when hovering. We can thus do without the borders and get a slightly cleaner look.

# 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
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