Re-organise to use a bare repo

Re-organise to use a bare repo, e.g.
https://www.atlassian.com/git/tutorials/dotfiles.

.zsh/configs/prompt.zsh

@@ -0,0 +1,45 @@
+source /usr/lib/git-core/git-sh-prompt
+
+git_is_repo() {
+  if [[ $(git rev-parse --is-inside-work-tree 2> /dev/null) == "true" ]]; then
+    return 1
+  fi
+
+  return 0
+}
+
+git_current_branch() {
+  echo $(git rev-parse --abbrev-ref HEAD)
+}
+
+git_repo_is_dirty() {
+  if [[ -z $(git status --short) ]]; then
+    return 1;
+  fi
+
+  return 0;
+}
+
+git_prompt_info() {
+  ! git_is_repo || return
+
+  current_branch=$(git_current_branch 2> /dev/null)
+  current_commit=$(git rev-parse --short HEAD 2> /dev/null)
+  suffix=''
+
+  if [[ ! -z ${current_commit} ]]; then
+    suffix="${suffix} [%{$fg_bold[yellow]%}${current_commit}%{$reset_color%}]"
+  fi
+
+  if git_repo_is_dirty; then
+    suffix="${suffix} %{$fg_bold[red]%}*%{$reset_color%}"
+  fi
+
+  if [[ -n git_current_branch ]]; then
+    echo " %{$fg_bold[green]%}$(__git_ps1 %s)%{$reset_color%}${suffix}"
+  fi
+}
+
+setopt promptsubst
+
+export PS1='${SSH_CONNECTION+"%{$fg_bold[green]%}%n@%m:"}%{$fg_bold[blue]%}%~%{$reset_color%}$(git_prompt_info) \$ '