Update themes/bakke/README.md

Co-authored-by: Koichi Murase <myoga.murase@gmail.com>

themes/bakke/README.md

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 - **Virtual Environments:** It displays information about Python virtual environments, such as virtualenv and condaenv, in parentheses and with specific colors.
 - **Main Prompt Structure:** It uses bold gray to form the main structure of the prompt, which includes the username, host, and current working directory.
 - **Additional Features:** It allows displaying additional information, such as the Ruby environment if present, and the use of RVM.
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 Overall, this theme offers a pleasant and functional user experience when working in the terminal, with a focus on clarity and relevant information for the user.