Use thoughtbot/dotfiles in protocol guide

* Explain the upcoming aliases.
* Use `g` alias.
* Use `[branch-name]` consistently (brackets and `-name` suffix).
* Remove `--rebase` due to discussion
  [here](https://github.com/thoughtbot/dotfiles/pull/111).
* Use `create-branch`, `merge-branch`, and `delete-branch` for clarity
  and speed.
* Use `staging` and `production` scripts.
* Use `rebase-origin` consistently.
* Replace `<>` style code comments with sentence instructions.
* Encourage the use of `git add --patch` via `g ap`.
* Change Thin recommendation to Unicorn.