Updated section 2b on git

handout/code/2a/cat_public_key.sh

handout/code/2a/create_gitignore.sh

handout/code/2a/git_add.sh

handout/code/2a/git_clone.sh

handout/code/2a/git_commit.sh

handout/code/2a/git_diff.sh

handout/code/2a/git_pull.sh

handout/code/2a/git_push.sh

handout/code/2a/git_status.sh

handout/code/2a/gitignore.txt

handout/code/2a/keygen.sh

handout/code/2a/ssh_config.txt

handout/code/2b/activate_venv_linux.sh

handout/code/2b/activate_venv_win.sh

handout/code/2b/create_venv.sh

handout/code/2b/deactivate_venv.sh

handout/code/2b/pip_install.sh

handout/code/2b/requrirements.txt

handout/code/2b/use_libraries-snippet.py

handout/code/2b/use_libraries.py