John Ogle 5a4ab71849 Add script to update doomemacs to latest commit
Creates update-doomemacs.sh script that:
- Fetches latest commit SHA from doomemacs/doomemacs repo
- Automatically detects the default branch
- Updates both rev and sha256 in home/roles/emacs/default.nix
- Works from anywhere in the repo using git rev-parse

Also adds a flake app so it can be run with:
  nix run .#update-doomemacs
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Description
No description provided
22 MiB
Languages
Nix 81.3%
Emacs Lisp 10.8%
Shell 4.9%
Python 3%