templates: remove redundant pull-left and pull-right for changeset progress bars "float: left" and "float: right" for these elements are already set in kallithea-diff.less. Aligns it with compare_diff.html which already didn't use "pull" on "node" and "changes".

# 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
.