Use broot and meld to diff before commit

A workflow guide for reviewing git changes before committing using broot (a terminal file navigator) and meld (a visual diff tool). It walks through installing broot, creating a dedicated git-diff config file, and setting up a `gg` bash function that launches broot in git-status mode. The config defines keyboard shortcuts for opening meld diffs, editing files in $EDITOR, running git add, and git checkout — all without leaving the TUI.