🌳 Bonsai release! - v2.0.0

🌳 treefetch - v2.0.0

A new year comes, and a new release as well! This time, we've added a new tree - a bonsai tree!

• feat: add a bonsai mode, callable with -b --bonsai.
• feat: add a help message displayed with -h or --help.
• BREAKING CHANGE: Remove the -xmas argument for displaying the Christmas tree. You must now use either -x or --xmas with a double hyphen. This is to make the argument consistent with conventions in CLI programs.
• refactor: Our @EdenQwQ refactored the treefetch code to improve correctness with the help of rust-analyzer.