Refactor to reduce config in group_vars

roles/dotfiles/README.md

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+# Dotfiles Deployment Guide
+
+Deploy dotfiles using [GNU Stow](https://www.gnu.org/software/stow/).
+
+Each subdirectory is a stow package corresponding to a set of related dotfiles.
+
+## Deploy Dotfiles
+
+Run Stow from within your dotfiles directory:
+
+```sh
+cd ~/dotfiles
+stow bash
+stow vim
+stow git
+```
+
+This will symlink the files into your `$HOME` directory.
+
+## Deploy All Dotfiles
+
+To deploy all dotfiles at once:
+
+```sh
+stow *
+```
+
+## Updating Dotfiles
+
+1. Edit files in the respective subdirectories.
+2. Commit and push changes as usual with Git.
+
+## Undoing a Stow
+
+To remove symlinks created by Stow:
+
+```sh
+stow -D bash
+```
+
+---
+
+For more details, see the [GNU Stow manual](https://www.gnu.org/software/stow/manual/stow.html).